To find all the divisors of the number 189,684:
- 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 189,684:
The prime factorization of a number: finding the prime numbers that multiply together to make that number.
189,684 = 22 × 32 × 11 × 479
189,684 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 = (2 + 1) × (2 + 1) × (1 + 1) × (1 + 1) = 3 × 3 × 2 × 2 = 36
But to actually calculate the factors, see below...
2. Multiply the prime factors of the number 189,684
- 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
composite factor = 2 × 3 =
6
composite factor = 3
2 =
9
prime factor =
11
composite factor = 2
2 × 3 =
12
composite factor = 2 × 3
2 =
18
composite factor = 2 × 11 =
22
composite factor = 3 × 11 =
33
composite factor = 2
2 × 3
2 =
36
composite factor = 2
2 × 11 =
44
composite factor = 2 × 3 × 11 =
66
composite factor = 3
2 × 11 =
99
composite factor = 2
2 × 3 × 11 =
132
composite factor = 2 × 3
2 × 11 =
198
composite factor = 2
2 × 3
2 × 11 =
396
This list continues below...
... This list continues from above
prime factor =
479
composite factor = 2 × 479 =
958
composite factor = 3 × 479 =
1,437
composite factor = 2
2 × 479 =
1,916
composite factor = 2 × 3 × 479 =
2,874
composite factor = 3
2 × 479 =
4,311
composite factor = 11 × 479 =
5,269
composite factor = 2
2 × 3 × 479 =
5,748
composite factor = 2 × 3
2 × 479 =
8,622
composite factor = 2 × 11 × 479 =
10,538
composite factor = 3 × 11 × 479 =
15,807
composite factor = 2
2 × 3
2 × 479 =
17,244
composite factor = 2
2 × 11 × 479 =
21,076
composite factor = 2 × 3 × 11 × 479 =
31,614
composite factor = 3
2 × 11 × 479 =
47,421
composite factor = 2
2 × 3 × 11 × 479 =
63,228
composite factor = 2 × 3
2 × 11 × 479 =
94,842
composite factor = 2
2 × 3
2 × 11 × 479 =
189,684
36 factors (divisors)
What times what is 189,684?
What number multiplied by what number equals 189,684?
All the combinations of any two natural numbers whose product equals 189,684.
1 × 189,684 = 189,684
2 × 94,842 = 189,684
3 × 63,228 = 189,684
4 × 47,421 = 189,684
6 × 31,614 = 189,684
9 × 21,076 = 189,684
11 × 17,244 = 189,684
12 × 15,807 = 189,684
18 × 10,538 = 189,684
22 × 8,622 = 189,684
33 × 5,748 = 189,684
36 × 5,269 = 189,684
44 × 4,311 = 189,684
66 × 2,874 = 189,684
99 × 1,916 = 189,684
132 × 1,437 = 189,684
198 × 958 = 189,684
396 × 479 = 189,684
18 unique multiplications The final answer:
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