To find all the divisors of the number 751,920:
- 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 751,920:
The prime factorization of a number: finding the prime numbers that multiply together to make that number.
751,920 = 24 × 3 × 5 × 13 × 241
751,920 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), ...
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 = (4 + 1) × (1 + 1) × (1 + 1) × (1 + 1) × (1 + 1) = 5 × 2 × 2 × 2 × 2 = 80
But to actually calculate the factors, see below...
2. Multiply the prime factors of the number 751,920
- 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
prime factor =
3
composite factor = 2
2 =
4
prime factor =
5
composite factor = 2 × 3 =
6
composite factor = 2
3 =
8
composite factor = 2 × 5 =
10
composite factor = 2
2 × 3 =
12
prime factor =
13
composite factor = 3 × 5 =
15
composite factor = 2
4 =
16
composite factor = 2
2 × 5 =
20
composite factor = 2
3 × 3 =
24
composite factor = 2 × 13 =
26
composite factor = 2 × 3 × 5 =
30
composite factor = 3 × 13 =
39
composite factor = 2
3 × 5 =
40
composite factor = 2
4 × 3 =
48
composite factor = 2
2 × 13 =
52
composite factor = 2
2 × 3 × 5 =
60
composite factor = 5 × 13 =
65
composite factor = 2 × 3 × 13 =
78
composite factor = 2
4 × 5 =
80
composite factor = 2
3 × 13 =
104
composite factor = 2
3 × 3 × 5 =
120
composite factor = 2 × 5 × 13 =
130
composite factor = 2
2 × 3 × 13 =
156
composite factor = 3 × 5 × 13 =
195
composite factor = 2
4 × 13 =
208
composite factor = 2
4 × 3 × 5 =
240
prime factor =
241
composite factor = 2
2 × 5 × 13 =
260
composite factor = 2
3 × 3 × 13 =
312
composite factor = 2 × 3 × 5 × 13 =
390
composite factor = 2 × 241 =
482
composite factor = 2
3 × 5 × 13 =
520
composite factor = 2
4 × 3 × 13 =
624
composite factor = 3 × 241 =
723
composite factor = 2
2 × 3 × 5 × 13 =
780
This list continues below...
... This list continues from above
composite factor = 2
2 × 241 =
964
composite factor = 2
4 × 5 × 13 =
1,040
composite factor = 5 × 241 =
1,205
composite factor = 2 × 3 × 241 =
1,446
composite factor = 2
3 × 3 × 5 × 13 =
1,560
composite factor = 2
3 × 241 =
1,928
composite factor = 2 × 5 × 241 =
2,410
composite factor = 2
2 × 3 × 241 =
2,892
composite factor = 2
4 × 3 × 5 × 13 =
3,120
composite factor = 13 × 241 =
3,133
composite factor = 3 × 5 × 241 =
3,615
composite factor = 2
4 × 241 =
3,856
composite factor = 2
2 × 5 × 241 =
4,820
composite factor = 2
3 × 3 × 241 =
5,784
composite factor = 2 × 13 × 241 =
6,266
composite factor = 2 × 3 × 5 × 241 =
7,230
composite factor = 3 × 13 × 241 =
9,399
composite factor = 2
3 × 5 × 241 =
9,640
composite factor = 2
4 × 3 × 241 =
11,568
composite factor = 2
2 × 13 × 241 =
12,532
composite factor = 2
2 × 3 × 5 × 241 =
14,460
composite factor = 5 × 13 × 241 =
15,665
composite factor = 2 × 3 × 13 × 241 =
18,798
composite factor = 2
4 × 5 × 241 =
19,280
composite factor = 2
3 × 13 × 241 =
25,064
composite factor = 2
3 × 3 × 5 × 241 =
28,920
composite factor = 2 × 5 × 13 × 241 =
31,330
composite factor = 2
2 × 3 × 13 × 241 =
37,596
composite factor = 3 × 5 × 13 × 241 =
46,995
composite factor = 2
4 × 13 × 241 =
50,128
composite factor = 2
4 × 3 × 5 × 241 =
57,840
composite factor = 2
2 × 5 × 13 × 241 =
62,660
composite factor = 2
3 × 3 × 13 × 241 =
75,192
composite factor = 2 × 3 × 5 × 13 × 241 =
93,990
composite factor = 2
3 × 5 × 13 × 241 =
125,320
composite factor = 2
4 × 3 × 13 × 241 =
150,384
composite factor = 2
2 × 3 × 5 × 13 × 241 =
187,980
composite factor = 2
4 × 5 × 13 × 241 =
250,640
composite factor = 2
3 × 3 × 5 × 13 × 241 =
375,960
composite factor = 2
4 × 3 × 5 × 13 × 241 =
751,920
80 factors (divisors)
What times what is 751,920?
What number multiplied by what number equals 751,920?
All the combinations of any two natural numbers whose product equals 751,920.
1 × 751,920 = 751,920
2 × 375,960 = 751,920
3 × 250,640 = 751,920
4 × 187,980 = 751,920
5 × 150,384 = 751,920
6 × 125,320 = 751,920
8 × 93,990 = 751,920
10 × 75,192 = 751,920
12 × 62,660 = 751,920
13 × 57,840 = 751,920
15 × 50,128 = 751,920
16 × 46,995 = 751,920
20 × 37,596 = 751,920
24 × 31,330 = 751,920
26 × 28,920 = 751,920
30 × 25,064 = 751,920
39 × 19,280 = 751,920
40 × 18,798 = 751,920
48 × 15,665 = 751,920
52 × 14,460 = 751,920
60 × 12,532 = 751,920
65 × 11,568 = 751,920
78 × 9,640 = 751,920
80 × 9,399 = 751,920
104 × 7,230 = 751,920
120 × 6,266 = 751,920
130 × 5,784 = 751,920
156 × 4,820 = 751,920
195 × 3,856 = 751,920
208 × 3,615 = 751,920
240 × 3,133 = 751,920
241 × 3,120 = 751,920
260 × 2,892 = 751,920
312 × 2,410 = 751,920
390 × 1,928 = 751,920
482 × 1,560 = 751,920
520 × 1,446 = 751,920
624 × 1,205 = 751,920
723 × 1,040 = 751,920
780 × 964 = 751,920
40 unique multiplications The final answer:
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