To find all the divisors of the number 14,320:
- 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 14,320:
The prime factorization of a number: finding the prime numbers that multiply together to make that number.
14,320 = 24 × 5 × 179
14,320 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) = 5 × 2 × 2 = 20
But to actually calculate the factors, see below...
2. Multiply the prime factors of the number 14,320
- 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
composite factor = 2
3 × 5 =
40
composite factor = 2
4 × 5 =
80
This list continues below...
... This list continues from above
prime factor =
179
composite factor = 2 × 179 =
358
composite factor = 2
2 × 179 =
716
composite factor = 5 × 179 =
895
composite factor = 2
3 × 179 =
1,432
composite factor = 2 × 5 × 179 =
1,790
composite factor = 2
4 × 179 =
2,864
composite factor = 2
2 × 5 × 179 =
3,580
composite factor = 2
3 × 5 × 179 =
7,160
composite factor = 2
4 × 5 × 179 =
14,320
20 factors (divisors)
What times what is 14,320?
What number multiplied by what number equals 14,320?
All the combinations of any two natural numbers whose product equals 14,320.
1 × 14,320 = 14,320
2 × 7,160 = 14,320
4 × 3,580 = 14,320
5 × 2,864 = 14,320
8 × 1,790 = 14,320
10 × 1,432 = 14,320
16 × 895 = 14,320
20 × 716 = 14,320
40 × 358 = 14,320
80 × 179 = 14,320
10 unique multiplications The final answer:
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