To find all the divisors of the number 118,146:
- 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 118,146:
The prime factorization of a number: finding the prime numbers that multiply together to make that number.
118,146 = 2 × 3 × 7 × 29 × 97
118,146 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 = (1 + 1) × (1 + 1) × (1 + 1) × (1 + 1) × (1 + 1) = 2 × 2 × 2 × 2 × 2 = 32
But to actually calculate the factors, see below...
2. Multiply the prime factors of the number 118,146
- Multiply the prime factors involved in the prime factorization of the number in all their unique combinations, that give different results.
- 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 × 3 =
6
prime factor =
7
composite factor = 2 × 7 =
14
composite factor = 3 × 7 =
21
prime factor =
29
composite factor = 2 × 3 × 7 =
42
composite factor = 2 × 29 =
58
composite factor = 3 × 29 =
87
prime factor =
97
composite factor = 2 × 3 × 29 =
174
composite factor = 2 × 97 =
194
composite factor = 7 × 29 =
203
composite factor = 3 × 97 =
291
This list continues below...
... This list continues from above
composite factor = 2 × 7 × 29 =
406
composite factor = 2 × 3 × 97 =
582
composite factor = 3 × 7 × 29 =
609
composite factor = 7 × 97 =
679
composite factor = 2 × 3 × 7 × 29 =
1,218
composite factor = 2 × 7 × 97 =
1,358
composite factor = 3 × 7 × 97 =
2,037
composite factor = 29 × 97 =
2,813
composite factor = 2 × 3 × 7 × 97 =
4,074
composite factor = 2 × 29 × 97 =
5,626
composite factor = 3 × 29 × 97 =
8,439
composite factor = 2 × 3 × 29 × 97 =
16,878
composite factor = 7 × 29 × 97 =
19,691
composite factor = 2 × 7 × 29 × 97 =
39,382
composite factor = 3 × 7 × 29 × 97 =
59,073
composite factor = 2 × 3 × 7 × 29 × 97 =
118,146
32 factors (divisors)
What times what is 118,146?
What number multiplied by what number equals 118,146?
All the combinations of any two natural numbers whose product equals 118,146.
1 × 118,146 = 118,146
2 × 59,073 = 118,146
3 × 39,382 = 118,146
6 × 19,691 = 118,146
7 × 16,878 = 118,146
14 × 8,439 = 118,146
21 × 5,626 = 118,146
29 × 4,074 = 118,146
42 × 2,813 = 118,146
58 × 2,037 = 118,146
87 × 1,358 = 118,146
97 × 1,218 = 118,146
174 × 679 = 118,146
194 × 609 = 118,146
203 × 582 = 118,146
291 × 406 = 118,146
16 unique multiplications The final answer:
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