To find all the divisors of the number 38,160:
- 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 38,160:
The prime factorization of a number: finding the prime numbers that multiply together to make that number.
38,160 = 24 × 32 × 5 × 53
38,160 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) × (2 + 1) × (1 + 1) × (1 + 1) = 5 × 3 × 2 × 2 = 60
But to actually calculate the factors, see below...
2. Multiply the prime factors of the number 38,160
- 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 = 3
2 =
9
composite factor = 2 × 5 =
10
composite factor = 2
2 × 3 =
12
composite factor = 3 × 5 =
15
composite factor = 2
4 =
16
composite factor = 2 × 3
2 =
18
composite factor = 2
2 × 5 =
20
composite factor = 2
3 × 3 =
24
composite factor = 2 × 3 × 5 =
30
composite factor = 2
2 × 3
2 =
36
composite factor = 2
3 × 5 =
40
composite factor = 3
2 × 5 =
45
composite factor = 2
4 × 3 =
48
prime factor =
53
composite factor = 2
2 × 3 × 5 =
60
composite factor = 2
3 × 3
2 =
72
composite factor = 2
4 × 5 =
80
composite factor = 2 × 3
2 × 5 =
90
composite factor = 2 × 53 =
106
composite factor = 2
3 × 3 × 5 =
120
composite factor = 2
4 × 3
2 =
144
composite factor = 3 × 53 =
159
composite factor = 2
2 × 3
2 × 5 =
180
This list continues below...
... This list continues from above
composite factor = 2
2 × 53 =
212
composite factor = 2
4 × 3 × 5 =
240
composite factor = 5 × 53 =
265
composite factor = 2 × 3 × 53 =
318
composite factor = 2
3 × 3
2 × 5 =
360
composite factor = 2
3 × 53 =
424
composite factor = 3
2 × 53 =
477
composite factor = 2 × 5 × 53 =
530
composite factor = 2
2 × 3 × 53 =
636
composite factor = 2
4 × 3
2 × 5 =
720
composite factor = 3 × 5 × 53 =
795
composite factor = 2
4 × 53 =
848
composite factor = 2 × 3
2 × 53 =
954
composite factor = 2
2 × 5 × 53 =
1,060
composite factor = 2
3 × 3 × 53 =
1,272
composite factor = 2 × 3 × 5 × 53 =
1,590
composite factor = 2
2 × 3
2 × 53 =
1,908
composite factor = 2
3 × 5 × 53 =
2,120
composite factor = 3
2 × 5 × 53 =
2,385
composite factor = 2
4 × 3 × 53 =
2,544
composite factor = 2
2 × 3 × 5 × 53 =
3,180
composite factor = 2
3 × 3
2 × 53 =
3,816
composite factor = 2
4 × 5 × 53 =
4,240
composite factor = 2 × 3
2 × 5 × 53 =
4,770
composite factor = 2
3 × 3 × 5 × 53 =
6,360
composite factor = 2
4 × 3
2 × 53 =
7,632
composite factor = 2
2 × 3
2 × 5 × 53 =
9,540
composite factor = 2
4 × 3 × 5 × 53 =
12,720
composite factor = 2
3 × 3
2 × 5 × 53 =
19,080
composite factor = 2
4 × 3
2 × 5 × 53 =
38,160
60 factors (divisors)
What times what is 38,160?
What number multiplied by what number equals 38,160?
All the combinations of any two natural numbers whose product equals 38,160.
1 × 38,160 = 38,160
2 × 19,080 = 38,160
3 × 12,720 = 38,160
4 × 9,540 = 38,160
5 × 7,632 = 38,160
6 × 6,360 = 38,160
8 × 4,770 = 38,160
9 × 4,240 = 38,160
10 × 3,816 = 38,160
12 × 3,180 = 38,160
15 × 2,544 = 38,160
16 × 2,385 = 38,160
18 × 2,120 = 38,160
20 × 1,908 = 38,160
24 × 1,590 = 38,160
30 × 1,272 = 38,160
36 × 1,060 = 38,160
40 × 954 = 38,160
45 × 848 = 38,160
48 × 795 = 38,160
53 × 720 = 38,160
60 × 636 = 38,160
72 × 530 = 38,160
80 × 477 = 38,160
90 × 424 = 38,160
106 × 360 = 38,160
120 × 318 = 38,160
144 × 265 = 38,160
159 × 240 = 38,160
180 × 212 = 38,160
30 unique multiplications The final answer:
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