To find all the divisors of the number 790,202,720:
- 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 790,202,720:
The prime factorization of a number: finding the prime numbers that multiply together to make that number.
790,202,720 = 25 × 5 × 23 × 214,729
790,202,720 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 = (5 + 1) × (1 + 1) × (1 + 1) × (1 + 1) = 6 × 2 × 2 × 2 = 48
But to actually calculate the factors, see below...
2. Multiply the prime factors of the number 790,202,720
- 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 = 2
2 =
4
prime factor =
5
composite factor = 2
3 =
8
composite factor = 2 × 5 =
10
composite factor = 2
4 =
16
composite factor = 2
2 × 5 =
20
prime factor =
23
composite factor = 2
5 =
32
composite factor = 2
3 × 5 =
40
composite factor = 2 × 23 =
46
composite factor = 2
4 × 5 =
80
composite factor = 2
2 × 23 =
92
composite factor = 5 × 23 =
115
composite factor = 2
5 × 5 =
160
composite factor = 2
3 × 23 =
184
composite factor = 2 × 5 × 23 =
230
composite factor = 2
4 × 23 =
368
composite factor = 2
2 × 5 × 23 =
460
composite factor = 2
5 × 23 =
736
composite factor = 2
3 × 5 × 23 =
920
composite factor = 2
4 × 5 × 23 =
1,840
composite factor = 2
5 × 5 × 23 =
3,680
This list continues below...
... This list continues from above
prime factor =
214,729
composite factor = 2 × 214,729 =
429,458
composite factor = 2
2 × 214,729 =
858,916
composite factor = 5 × 214,729 =
1,073,645
composite factor = 2
3 × 214,729 =
1,717,832
composite factor = 2 × 5 × 214,729 =
2,147,290
composite factor = 2
4 × 214,729 =
3,435,664
composite factor = 2
2 × 5 × 214,729 =
4,294,580
composite factor = 23 × 214,729 =
4,938,767
composite factor = 2
5 × 214,729 =
6,871,328
composite factor = 2
3 × 5 × 214,729 =
8,589,160
composite factor = 2 × 23 × 214,729 =
9,877,534
composite factor = 2
4 × 5 × 214,729 =
17,178,320
composite factor = 2
2 × 23 × 214,729 =
19,755,068
composite factor = 5 × 23 × 214,729 =
24,693,835
composite factor = 2
5 × 5 × 214,729 =
34,356,640
composite factor = 2
3 × 23 × 214,729 =
39,510,136
composite factor = 2 × 5 × 23 × 214,729 =
49,387,670
composite factor = 2
4 × 23 × 214,729 =
79,020,272
composite factor = 2
2 × 5 × 23 × 214,729 =
98,775,340
composite factor = 2
5 × 23 × 214,729 =
158,040,544
composite factor = 2
3 × 5 × 23 × 214,729 =
197,550,680
composite factor = 2
4 × 5 × 23 × 214,729 =
395,101,360
composite factor = 2
5 × 5 × 23 × 214,729 =
790,202,720
48 factors (divisors)
What times what is 790,202,720?
What number multiplied by what number equals 790,202,720?
All the combinations of any two natural numbers whose product equals 790,202,720.
1 × 790,202,720 = 790,202,720
2 × 395,101,360 = 790,202,720
4 × 197,550,680 = 790,202,720
5 × 158,040,544 = 790,202,720
8 × 98,775,340 = 790,202,720
10 × 79,020,272 = 790,202,720
16 × 49,387,670 = 790,202,720
20 × 39,510,136 = 790,202,720
23 × 34,356,640 = 790,202,720
32 × 24,693,835 = 790,202,720
40 × 19,755,068 = 790,202,720
46 × 17,178,320 = 790,202,720
80 × 9,877,534 = 790,202,720
92 × 8,589,160 = 790,202,720
115 × 6,871,328 = 790,202,720
160 × 4,938,767 = 790,202,720
184 × 4,294,580 = 790,202,720
230 × 3,435,664 = 790,202,720
368 × 2,147,290 = 790,202,720
460 × 1,717,832 = 790,202,720
736 × 1,073,645 = 790,202,720
920 × 858,916 = 790,202,720
1,840 × 429,458 = 790,202,720
3,680 × 214,729 = 790,202,720
24 unique multiplications The final answer:
(scroll down)