To find all the divisors of the number 22,880:
- 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 22,880:
The prime factorization of a number: finding the prime numbers that multiply together to make that number.
22,880 = 25 × 5 × 11 × 13
22,880 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 22,880
- 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
prime factor =
11
prime factor =
13
composite factor = 2
4 =
16
composite factor = 2
2 × 5 =
20
composite factor = 2 × 11 =
22
composite factor = 2 × 13 =
26
composite factor = 2
5 =
32
composite factor = 2
3 × 5 =
40
composite factor = 2
2 × 11 =
44
composite factor = 2
2 × 13 =
52
composite factor = 5 × 11 =
55
composite factor = 5 × 13 =
65
composite factor = 2
4 × 5 =
80
composite factor = 2
3 × 11 =
88
composite factor = 2
3 × 13 =
104
composite factor = 2 × 5 × 11 =
110
composite factor = 2 × 5 × 13 =
130
composite factor = 11 × 13 =
143
This list continues below...
... This list continues from above
composite factor = 2
5 × 5 =
160
composite factor = 2
4 × 11 =
176
composite factor = 2
4 × 13 =
208
composite factor = 2
2 × 5 × 11 =
220
composite factor = 2
2 × 5 × 13 =
260
composite factor = 2 × 11 × 13 =
286
composite factor = 2
5 × 11 =
352
composite factor = 2
5 × 13 =
416
composite factor = 2
3 × 5 × 11 =
440
composite factor = 2
3 × 5 × 13 =
520
composite factor = 2
2 × 11 × 13 =
572
composite factor = 5 × 11 × 13 =
715
composite factor = 2
4 × 5 × 11 =
880
composite factor = 2
4 × 5 × 13 =
1,040
composite factor = 2
3 × 11 × 13 =
1,144
composite factor = 2 × 5 × 11 × 13 =
1,430
composite factor = 2
5 × 5 × 11 =
1,760
composite factor = 2
5 × 5 × 13 =
2,080
composite factor = 2
4 × 11 × 13 =
2,288
composite factor = 2
2 × 5 × 11 × 13 =
2,860
composite factor = 2
5 × 11 × 13 =
4,576
composite factor = 2
3 × 5 × 11 × 13 =
5,720
composite factor = 2
4 × 5 × 11 × 13 =
11,440
composite factor = 2
5 × 5 × 11 × 13 =
22,880
48 factors (divisors)
What times what is 22,880?
What number multiplied by what number equals 22,880?
All the combinations of any two natural numbers whose product equals 22,880.
1 × 22,880 = 22,880
2 × 11,440 = 22,880
4 × 5,720 = 22,880
5 × 4,576 = 22,880
8 × 2,860 = 22,880
10 × 2,288 = 22,880
11 × 2,080 = 22,880
13 × 1,760 = 22,880
16 × 1,430 = 22,880
20 × 1,144 = 22,880
22 × 1,040 = 22,880
26 × 880 = 22,880
32 × 715 = 22,880
40 × 572 = 22,880
44 × 520 = 22,880
52 × 440 = 22,880
55 × 416 = 22,880
65 × 352 = 22,880
80 × 286 = 22,880
88 × 260 = 22,880
104 × 220 = 22,880
110 × 208 = 22,880
130 × 176 = 22,880
143 × 160 = 22,880
24 unique multiplications The final answer:
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