Factors of 13,600,000,000. Calculator of Proper, Improper, Prime and Compound Divisors, if Any

All the factors (divisors) of the number 13,600,000,000. Connection with the prime factorization of the number

To find all the divisors of the number 13,600,000,000:

  • 1. Decompose the number into prime factors.
  • See how you can find out how many factors (divisors) the number has, without actually calculating them.
  • 2. Multiply the prime factors in all their unique combinations, that yield different results.

1. Carry out the prime factorization of the number 13,600,000,000:

The prime factorization of a number: finding the prime numbers that multiply together to make that number.


13,600,000,000 = 211 × 58 × 17
13,600,000,000 is not a prime number but a composite one.


  • Prime number: a natural number that is divisible (divided evenly) only by 1 and itself. A prime number has exactly two factors: 1 and the number itself.
  • Examples of prime numbers: 2 (factors 1, 2), 3 (factors 1, 3), 5 (factors 1, 5), 7 (factors 1, 7), 11 (factors 1, 11), 13 (factors 1, 13), ...
  • Composite number: a natural number that has at least one factor other than 1 and itself. So it is neither a prime number nor 1.
  • Examples of composite numbers: 4 (it has 3 factors: 1, 2, 4), 6 (it has 4 factors: 1, 2, 3, 6), 8 (it has 4 factors: 1, 2, 4, 8), 9 (it has 3 factors: 1, 3, 9), 10 (it has 4 factors: 1, 2, 5, 10), 12 (it has 6 factors: 1, 2, 3, 4, 6, 12), ...

  • » Online calculator. Check whether a number is prime or not. The prime factorization of composite numbers (decomposition into prime factors)


How to count the number of factors of a number?

Without actually finding the factors

  • If a number N is prime factorized as:
    N = am × bk × cz
    where a, b, c are the prime factors and m, k, z are their exponents, natural numbers, ....
  • ...
  • Then the number of factors of the number N can be calculated as:
    n = (m + 1) × (k + 1) × (z + 1)
  • ...
  • In our case, the number of factors is calculated as:
  • n = (11 + 1) × (8 + 1) × (1 + 1) = 12 × 9 × 2 = 216

But to actually calculate the factors, see below...

2. Multiply the prime factors of the number 13,600,000,000

  • Multiply the prime factors involved in the prime factorization of the number in all their unique combinations, that give different results.
  • Also consider the exponents of these prime factors.
  • Also add 1 to the list of factors (divisors). All the numbers are divisible by 1.

All the factors (divisors) are listed below - in ascending order

The list of factors (divisors):

Numbers other than 1 that are not prime factors are composite factors (divisors).

neither prime nor composite = 1
prime factor = 2
composite factor = 22 = 4
prime factor = 5
composite factor = 23 = 8
composite factor = 2 × 5 = 10
composite factor = 24 = 16
prime factor = 17
composite factor = 22 × 5 = 20
composite factor = 52 = 25
composite factor = 25 = 32
composite factor = 2 × 17 = 34
composite factor = 23 × 5 = 40
composite factor = 2 × 52 = 50
composite factor = 26 = 64
composite factor = 22 × 17 = 68
composite factor = 24 × 5 = 80
composite factor = 5 × 17 = 85
composite factor = 22 × 52 = 100
composite factor = 53 = 125
composite factor = 27 = 128
composite factor = 23 × 17 = 136
composite factor = 25 × 5 = 160
composite factor = 2 × 5 × 17 = 170
composite factor = 23 × 52 = 200
composite factor = 2 × 53 = 250
composite factor = 28 = 256
composite factor = 24 × 17 = 272
composite factor = 26 × 5 = 320
composite factor = 22 × 5 × 17 = 340
composite factor = 24 × 52 = 400
composite factor = 52 × 17 = 425
composite factor = 22 × 53 = 500
composite factor = 29 = 512
composite factor = 25 × 17 = 544
composite factor = 54 = 625
composite factor = 27 × 5 = 640
composite factor = 23 × 5 × 17 = 680
composite factor = 25 × 52 = 800
composite factor = 2 × 52 × 17 = 850
composite factor = 23 × 53 = 1,000
composite factor = 210 = 1,024
composite factor = 26 × 17 = 1,088
composite factor = 2 × 54 = 1,250
composite factor = 28 × 5 = 1,280
composite factor = 24 × 5 × 17 = 1,360
composite factor = 26 × 52 = 1,600
composite factor = 22 × 52 × 17 = 1,700
composite factor = 24 × 53 = 2,000
composite factor = 211 = 2,048
composite factor = 53 × 17 = 2,125
composite factor = 27 × 17 = 2,176
composite factor = 22 × 54 = 2,500
composite factor = 29 × 5 = 2,560
composite factor = 25 × 5 × 17 = 2,720
composite factor = 55 = 3,125
composite factor = 27 × 52 = 3,200
composite factor = 23 × 52 × 17 = 3,400
composite factor = 25 × 53 = 4,000
composite factor = 2 × 53 × 17 = 4,250
composite factor = 28 × 17 = 4,352
composite factor = 23 × 54 = 5,000
composite factor = 210 × 5 = 5,120
composite factor = 26 × 5 × 17 = 5,440
composite factor = 2 × 55 = 6,250
composite factor = 28 × 52 = 6,400
composite factor = 24 × 52 × 17 = 6,800
composite factor = 26 × 53 = 8,000
composite factor = 22 × 53 × 17 = 8,500
composite factor = 29 × 17 = 8,704
composite factor = 24 × 54 = 10,000
composite factor = 211 × 5 = 10,240
composite factor = 54 × 17 = 10,625
composite factor = 27 × 5 × 17 = 10,880
composite factor = 22 × 55 = 12,500
composite factor = 29 × 52 = 12,800
composite factor = 25 × 52 × 17 = 13,600
composite factor = 56 = 15,625
composite factor = 27 × 53 = 16,000
composite factor = 23 × 53 × 17 = 17,000
composite factor = 210 × 17 = 17,408
composite factor = 25 × 54 = 20,000
composite factor = 2 × 54 × 17 = 21,250
composite factor = 28 × 5 × 17 = 21,760
composite factor = 23 × 55 = 25,000
composite factor = 210 × 52 = 25,600
composite factor = 26 × 52 × 17 = 27,200
composite factor = 2 × 56 = 31,250
composite factor = 28 × 53 = 32,000
composite factor = 24 × 53 × 17 = 34,000
composite factor = 211 × 17 = 34,816
composite factor = 26 × 54 = 40,000
composite factor = 22 × 54 × 17 = 42,500
composite factor = 29 × 5 × 17 = 43,520
composite factor = 24 × 55 = 50,000
composite factor = 211 × 52 = 51,200
composite factor = 55 × 17 = 53,125
composite factor = 27 × 52 × 17 = 54,400
composite factor = 22 × 56 = 62,500
composite factor = 29 × 53 = 64,000
composite factor = 25 × 53 × 17 = 68,000
composite factor = 57 = 78,125
composite factor = 27 × 54 = 80,000
composite factor = 23 × 54 × 17 = 85,000
composite factor = 210 × 5 × 17 = 87,040
composite factor = 25 × 55 = 100,000
composite factor = 2 × 55 × 17 = 106,250
composite factor = 28 × 52 × 17 = 108,800
This list continues below...

... This list continues from above
composite factor = 23 × 56 = 125,000
composite factor = 210 × 53 = 128,000
composite factor = 26 × 53 × 17 = 136,000
composite factor = 2 × 57 = 156,250
composite factor = 28 × 54 = 160,000
composite factor = 24 × 54 × 17 = 170,000
composite factor = 211 × 5 × 17 = 174,080
composite factor = 26 × 55 = 200,000
composite factor = 22 × 55 × 17 = 212,500
composite factor = 29 × 52 × 17 = 217,600
composite factor = 24 × 56 = 250,000
composite factor = 211 × 53 = 256,000
composite factor = 56 × 17 = 265,625
composite factor = 27 × 53 × 17 = 272,000
composite factor = 22 × 57 = 312,500
composite factor = 29 × 54 = 320,000
composite factor = 25 × 54 × 17 = 340,000
composite factor = 58 = 390,625
composite factor = 27 × 55 = 400,000
composite factor = 23 × 55 × 17 = 425,000
composite factor = 210 × 52 × 17 = 435,200
composite factor = 25 × 56 = 500,000
composite factor = 2 × 56 × 17 = 531,250
composite factor = 28 × 53 × 17 = 544,000
composite factor = 23 × 57 = 625,000
composite factor = 210 × 54 = 640,000
composite factor = 26 × 54 × 17 = 680,000
composite factor = 2 × 58 = 781,250
composite factor = 28 × 55 = 800,000
composite factor = 24 × 55 × 17 = 850,000
composite factor = 211 × 52 × 17 = 870,400
composite factor = 26 × 56 = 1,000,000
composite factor = 22 × 56 × 17 = 1,062,500
composite factor = 29 × 53 × 17 = 1,088,000
composite factor = 24 × 57 = 1,250,000
composite factor = 211 × 54 = 1,280,000
composite factor = 57 × 17 = 1,328,125
composite factor = 27 × 54 × 17 = 1,360,000
composite factor = 22 × 58 = 1,562,500
composite factor = 29 × 55 = 1,600,000
composite factor = 25 × 55 × 17 = 1,700,000
composite factor = 27 × 56 = 2,000,000
composite factor = 23 × 56 × 17 = 2,125,000
composite factor = 210 × 53 × 17 = 2,176,000
composite factor = 25 × 57 = 2,500,000
composite factor = 2 × 57 × 17 = 2,656,250
composite factor = 28 × 54 × 17 = 2,720,000
composite factor = 23 × 58 = 3,125,000
composite factor = 210 × 55 = 3,200,000
composite factor = 26 × 55 × 17 = 3,400,000
composite factor = 28 × 56 = 4,000,000
composite factor = 24 × 56 × 17 = 4,250,000
composite factor = 211 × 53 × 17 = 4,352,000
composite factor = 26 × 57 = 5,000,000
composite factor = 22 × 57 × 17 = 5,312,500
composite factor = 29 × 54 × 17 = 5,440,000
composite factor = 24 × 58 = 6,250,000
composite factor = 211 × 55 = 6,400,000
composite factor = 58 × 17 = 6,640,625
composite factor = 27 × 55 × 17 = 6,800,000
composite factor = 29 × 56 = 8,000,000
composite factor = 25 × 56 × 17 = 8,500,000
composite factor = 27 × 57 = 10,000,000
composite factor = 23 × 57 × 17 = 10,625,000
composite factor = 210 × 54 × 17 = 10,880,000
composite factor = 25 × 58 = 12,500,000
composite factor = 2 × 58 × 17 = 13,281,250
composite factor = 28 × 55 × 17 = 13,600,000
composite factor = 210 × 56 = 16,000,000
composite factor = 26 × 56 × 17 = 17,000,000
composite factor = 28 × 57 = 20,000,000
composite factor = 24 × 57 × 17 = 21,250,000
composite factor = 211 × 54 × 17 = 21,760,000
composite factor = 26 × 58 = 25,000,000
composite factor = 22 × 58 × 17 = 26,562,500
composite factor = 29 × 55 × 17 = 27,200,000
composite factor = 211 × 56 = 32,000,000
composite factor = 27 × 56 × 17 = 34,000,000
composite factor = 29 × 57 = 40,000,000
composite factor = 25 × 57 × 17 = 42,500,000
composite factor = 27 × 58 = 50,000,000
composite factor = 23 × 58 × 17 = 53,125,000
composite factor = 210 × 55 × 17 = 54,400,000
composite factor = 28 × 56 × 17 = 68,000,000
composite factor = 210 × 57 = 80,000,000
composite factor = 26 × 57 × 17 = 85,000,000
composite factor = 28 × 58 = 100,000,000
composite factor = 24 × 58 × 17 = 106,250,000
composite factor = 211 × 55 × 17 = 108,800,000
composite factor = 29 × 56 × 17 = 136,000,000
composite factor = 211 × 57 = 160,000,000
composite factor = 27 × 57 × 17 = 170,000,000
composite factor = 29 × 58 = 200,000,000
composite factor = 25 × 58 × 17 = 212,500,000
composite factor = 210 × 56 × 17 = 272,000,000
composite factor = 28 × 57 × 17 = 340,000,000
composite factor = 210 × 58 = 400,000,000
composite factor = 26 × 58 × 17 = 425,000,000
composite factor = 211 × 56 × 17 = 544,000,000
composite factor = 29 × 57 × 17 = 680,000,000
composite factor = 211 × 58 = 800,000,000
composite factor = 27 × 58 × 17 = 850,000,000
composite factor = 210 × 57 × 17 = 1,360,000,000
composite factor = 28 × 58 × 17 = 1,700,000,000
composite factor = 211 × 57 × 17 = 2,720,000,000
composite factor = 29 × 58 × 17 = 3,400,000,000
composite factor = 210 × 58 × 17 = 6,800,000,000
composite factor = 211 × 58 × 17 = 13,600,000,000
216 factors (divisors)

What times what is 13,600,000,000?
What number multiplied by what number equals 13,600,000,000?

All the combinations of any two natural numbers whose product equals 13,600,000,000.

1 × 13,600,000,000 = 13,600,000,000
2 × 6,800,000,000 = 13,600,000,000
4 × 3,400,000,000 = 13,600,000,000
5 × 2,720,000,000 = 13,600,000,000
8 × 1,700,000,000 = 13,600,000,000
10 × 1,360,000,000 = 13,600,000,000
16 × 850,000,000 = 13,600,000,000
17 × 800,000,000 = 13,600,000,000
20 × 680,000,000 = 13,600,000,000
25 × 544,000,000 = 13,600,000,000
32 × 425,000,000 = 13,600,000,000
34 × 400,000,000 = 13,600,000,000
40 × 340,000,000 = 13,600,000,000
50 × 272,000,000 = 13,600,000,000
64 × 212,500,000 = 13,600,000,000
68 × 200,000,000 = 13,600,000,000
80 × 170,000,000 = 13,600,000,000
85 × 160,000,000 = 13,600,000,000
100 × 136,000,000 = 13,600,000,000
125 × 108,800,000 = 13,600,000,000
128 × 106,250,000 = 13,600,000,000
136 × 100,000,000 = 13,600,000,000
160 × 85,000,000 = 13,600,000,000
170 × 80,000,000 = 13,600,000,000
200 × 68,000,000 = 13,600,000,000
250 × 54,400,000 = 13,600,000,000
256 × 53,125,000 = 13,600,000,000
272 × 50,000,000 = 13,600,000,000
320 × 42,500,000 = 13,600,000,000
340 × 40,000,000 = 13,600,000,000
400 × 34,000,000 = 13,600,000,000
425 × 32,000,000 = 13,600,000,000
500 × 27,200,000 = 13,600,000,000
512 × 26,562,500 = 13,600,000,000
544 × 25,000,000 = 13,600,000,000
625 × 21,760,000 = 13,600,000,000
640 × 21,250,000 = 13,600,000,000
680 × 20,000,000 = 13,600,000,000
800 × 17,000,000 = 13,600,000,000
850 × 16,000,000 = 13,600,000,000
1,000 × 13,600,000 = 13,600,000,000
1,024 × 13,281,250 = 13,600,000,000
1,088 × 12,500,000 = 13,600,000,000
1,250 × 10,880,000 = 13,600,000,000
1,280 × 10,625,000 = 13,600,000,000
1,360 × 10,000,000 = 13,600,000,000
1,600 × 8,500,000 = 13,600,000,000
1,700 × 8,000,000 = 13,600,000,000
2,000 × 6,800,000 = 13,600,000,000
2,048 × 6,640,625 = 13,600,000,000
2,125 × 6,400,000 = 13,600,000,000
2,176 × 6,250,000 = 13,600,000,000
2,500 × 5,440,000 = 13,600,000,000
2,560 × 5,312,500 = 13,600,000,000
2,720 × 5,000,000 = 13,600,000,000
3,125 × 4,352,000 = 13,600,000,000
3,200 × 4,250,000 = 13,600,000,000
3,400 × 4,000,000 = 13,600,000,000
4,000 × 3,400,000 = 13,600,000,000
4,250 × 3,200,000 = 13,600,000,000
4,352 × 3,125,000 = 13,600,000,000
5,000 × 2,720,000 = 13,600,000,000
5,120 × 2,656,250 = 13,600,000,000
5,440 × 2,500,000 = 13,600,000,000
6,250 × 2,176,000 = 13,600,000,000
6,400 × 2,125,000 = 13,600,000,000
6,800 × 2,000,000 = 13,600,000,000
8,000 × 1,700,000 = 13,600,000,000
8,500 × 1,600,000 = 13,600,000,000
8,704 × 1,562,500 = 13,600,000,000
10,000 × 1,360,000 = 13,600,000,000
10,240 × 1,328,125 = 13,600,000,000
10,625 × 1,280,000 = 13,600,000,000
10,880 × 1,250,000 = 13,600,000,000
12,500 × 1,088,000 = 13,600,000,000
12,800 × 1,062,500 = 13,600,000,000
13,600 × 1,000,000 = 13,600,000,000
15,625 × 870,400 = 13,600,000,000
16,000 × 850,000 = 13,600,000,000
17,000 × 800,000 = 13,600,000,000
17,408 × 781,250 = 13,600,000,000
20,000 × 680,000 = 13,600,000,000
21,250 × 640,000 = 13,600,000,000
21,760 × 625,000 = 13,600,000,000
25,000 × 544,000 = 13,600,000,000
25,600 × 531,250 = 13,600,000,000
27,200 × 500,000 = 13,600,000,000
31,250 × 435,200 = 13,600,000,000
32,000 × 425,000 = 13,600,000,000
34,000 × 400,000 = 13,600,000,000
34,816 × 390,625 = 13,600,000,000
40,000 × 340,000 = 13,600,000,000
42,500 × 320,000 = 13,600,000,000
43,520 × 312,500 = 13,600,000,000
50,000 × 272,000 = 13,600,000,000
51,200 × 265,625 = 13,600,000,000
53,125 × 256,000 = 13,600,000,000
54,400 × 250,000 = 13,600,000,000
62,500 × 217,600 = 13,600,000,000
64,000 × 212,500 = 13,600,000,000
68,000 × 200,000 = 13,600,000,000
78,125 × 174,080 = 13,600,000,000
80,000 × 170,000 = 13,600,000,000
85,000 × 160,000 = 13,600,000,000
87,040 × 156,250 = 13,600,000,000
100,000 × 136,000 = 13,600,000,000
106,250 × 128,000 = 13,600,000,000
108,800 × 125,000 = 13,600,000,000
108 unique multiplications

The final answer:
(scroll down)


13,600,000,000 has 216 factors (divisors):
1; 2; 4; 5; 8; 10; 16; 17; 20; 25; 32; 34; 40; 50; 64; 68; 80; 85; 100; 125; 128; 136; 160; 170; 200; 250; 256; 272; 320; 340; 400; 425; 500; 512; 544; 625; 640; 680; 800; 850; 1,000; 1,024; 1,088; 1,250; 1,280; 1,360; 1,600; 1,700; 2,000; 2,048; 2,125; 2,176; 2,500; 2,560; 2,720; 3,125; 3,200; 3,400; 4,000; 4,250; 4,352; 5,000; 5,120; 5,440; 6,250; 6,400; 6,800; 8,000; 8,500; 8,704; 10,000; 10,240; 10,625; 10,880; 12,500; 12,800; 13,600; 15,625; 16,000; 17,000; 17,408; 20,000; 21,250; 21,760; 25,000; 25,600; 27,200; 31,250; 32,000; 34,000; 34,816; 40,000; 42,500; 43,520; 50,000; 51,200; 53,125; 54,400; 62,500; 64,000; 68,000; 78,125; 80,000; 85,000; 87,040; 100,000; 106,250; 108,800; 125,000; 128,000; 136,000; 156,250; 160,000; 170,000; 174,080; 200,000; 212,500; 217,600; 250,000; 256,000; 265,625; 272,000; 312,500; 320,000; 340,000; 390,625; 400,000; 425,000; 435,200; 500,000; 531,250; 544,000; 625,000; 640,000; 680,000; 781,250; 800,000; 850,000; 870,400; 1,000,000; 1,062,500; 1,088,000; 1,250,000; 1,280,000; 1,328,125; 1,360,000; 1,562,500; 1,600,000; 1,700,000; 2,000,000; 2,125,000; 2,176,000; 2,500,000; 2,656,250; 2,720,000; 3,125,000; 3,200,000; 3,400,000; 4,000,000; 4,250,000; 4,352,000; 5,000,000; 5,312,500; 5,440,000; 6,250,000; 6,400,000; 6,640,625; 6,800,000; 8,000,000; 8,500,000; 10,000,000; 10,625,000; 10,880,000; 12,500,000; 13,281,250; 13,600,000; 16,000,000; 17,000,000; 20,000,000; 21,250,000; 21,760,000; 25,000,000; 26,562,500; 27,200,000; 32,000,000; 34,000,000; 40,000,000; 42,500,000; 50,000,000; 53,125,000; 54,400,000; 68,000,000; 80,000,000; 85,000,000; 100,000,000; 106,250,000; 108,800,000; 136,000,000; 160,000,000; 170,000,000; 200,000,000; 212,500,000; 272,000,000; 340,000,000; 400,000,000; 425,000,000; 544,000,000; 680,000,000; 800,000,000; 850,000,000; 1,360,000,000; 1,700,000,000; 2,720,000,000; 3,400,000,000; 6,800,000,000 and 13,600,000,000
out of which 3 prime factors: 2; 5 and 17.
Numbers other than 1 that are not prime factors are composite factors (divisors).
13,600,000,000 and 1 are sometimes called improper factors, the others are called proper factors (proper divisors).

  • A quick way to find the factors (the divisors) of a number is to break it down into prime factors.
  • Then multiply the prime factors and their exponents, if any, in all their different combinations.

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Factors (divisors), common factors (common divisors), the greatest common factor, GCF (also called the greatest common divisor, GCD, or the highest common factor, HCF)

  • If the number "t" is a factor (divisor) of the number "a" then in the prime factorization of "t" we will only encounter prime factors that also occur in the prime factorization of "a".
  • If there are exponents involved, the maximum value of an exponent for any base of a power that is found in the prime factorization of "t" (powers, or multiplicities) is at most equal to the exponent of the same base that is involved in the prime factorization of "a".
  • Hint: 23 = 2 × 2 × 2 = 8. 2 is called the base and 3 is the exponent. 23 is the power and 8 is the value of the power. We sometimes say that the number 2 is raised to the power of 3.
  • For example, 12 is a factor (divisor) of 120 - the remainder is zero when dividing 120 by 12.
  • Let's look at the prime factorization of both numbers and notice the bases and the exponents that occur in the prime factorization of both numbers:
  • 12 = 2 × 2 × 3 = 22 × 3
  • 120 = 2 × 2 × 2 × 3 × 5 = 23 × 3 × 5
  • 120 contains all the prime factors of 12, and all its bases' exponents are higher than those of 12.
  • If "t" is a common factor (divisor) of "a" and "b", then the prime factorization of "t" contains only the common prime factors involved in the prime factorizations of both "a" and "b".
  • If there are exponents involved, the maximum value of an exponent for any base of a power that is found in the prime factorization of "t" is at most equal to the minimum of the exponents of the same base that is involved in the prime factorization of both "a" and "b".
  • For example, 12 is the common factor of 48 and 360.
  • The remainder is zero when dividing either 48 or 360 by 12.
  • Here there are the prime factorizations of the three numbers, 12, 48 and 360:
  • 12 = 22 × 3
  • 48 = 24 × 3
  • 360 = 23 × 32 × 5
  • Please note that 48 and 360 have more factors (divisors): 2, 3, 4, 6, 8, 12, 24. Among them, 24 is the greatest common factor, GCF (or the greatest common divisor, GCD, or the highest common factor, HCF) of 48 and 360.
  • The greatest common factor, GCF, of two numbers, "a" and "b", is the product of all the common prime factors involved in the prime factorizations of both "a" and "b", taken by the lowest exponents.
  • Based on this rule it is calculated the greatest common factor, GCF, (or the greatest common divisor GCD, HCF) of several numbers, as shown in the example below...
  • GCF, GCD (1,260; 3,024; 5,544) = ?
  • 1,260 = 22 × 32
  • 3,024 = 24 × 32 × 7
  • 5,544 = 23 × 32 × 7 × 11
  • The common prime factors are:
  • 2 - its lowest exponent (multiplicity) is: min.(2; 3; 4) = 2
  • 3 - its lowest exponent (multiplicity) is: min.(2; 2; 2) = 2
  • GCF, GCD (1,260; 3,024; 5,544) = 22 × 32 = 252
  • Coprime numbers:
  • If two numbers "a" and "b" have no other common factors (divisors) than 1, gfc, gcd, hcf (a; b) = 1, then the numbers "a" and "b" are called coprime (or relatively prime).
  • Factors of the GCF
  • If "a" and "b" are not coprime, then every common factor (divisor) of "a" and "b" is a also a factor (divisor) of the greatest common factor, GCF (greatest common divisor, GCD, highest common factor, HCF) of "a" and "b".