To find all the divisors of the number 118,471,782:
- 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 118,471,782:
The prime factorization of a number: finding the prime numbers that multiply together to make that number.
118,471,782 = 2 × 3 × 11 × 13 × 138,079
118,471,782 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 118,471,782
- 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 =
11
prime factor =
13
composite factor = 2 × 11 =
22
composite factor = 2 × 13 =
26
composite factor = 3 × 11 =
33
composite factor = 3 × 13 =
39
composite factor = 2 × 3 × 11 =
66
composite factor = 2 × 3 × 13 =
78
composite factor = 11 × 13 =
143
composite factor = 2 × 11 × 13 =
286
composite factor = 3 × 11 × 13 =
429
composite factor = 2 × 3 × 11 × 13 =
858
This list continues below...
... This list continues from above
prime factor =
138,079
composite factor = 2 × 138,079 =
276,158
composite factor = 3 × 138,079 =
414,237
composite factor = 2 × 3 × 138,079 =
828,474
composite factor = 11 × 138,079 =
1,518,869
composite factor = 13 × 138,079 =
1,795,027
composite factor = 2 × 11 × 138,079 =
3,037,738
composite factor = 2 × 13 × 138,079 =
3,590,054
composite factor = 3 × 11 × 138,079 =
4,556,607
composite factor = 3 × 13 × 138,079 =
5,385,081
composite factor = 2 × 3 × 11 × 138,079 =
9,113,214
composite factor = 2 × 3 × 13 × 138,079 =
10,770,162
composite factor = 11 × 13 × 138,079 =
19,745,297
composite factor = 2 × 11 × 13 × 138,079 =
39,490,594
composite factor = 3 × 11 × 13 × 138,079 =
59,235,891
composite factor = 2 × 3 × 11 × 13 × 138,079 =
118,471,782
32 factors (divisors)
What times what is 118,471,782?
What number multiplied by what number equals 118,471,782?
All the combinations of any two natural numbers whose product equals 118,471,782.
1 × 118,471,782 = 118,471,782
2 × 59,235,891 = 118,471,782
3 × 39,490,594 = 118,471,782
6 × 19,745,297 = 118,471,782
11 × 10,770,162 = 118,471,782
13 × 9,113,214 = 118,471,782
22 × 5,385,081 = 118,471,782
26 × 4,556,607 = 118,471,782
33 × 3,590,054 = 118,471,782
39 × 3,037,738 = 118,471,782
66 × 1,795,027 = 118,471,782
78 × 1,518,869 = 118,471,782
143 × 828,474 = 118,471,782
286 × 414,237 = 118,471,782
429 × 276,158 = 118,471,782
858 × 138,079 = 118,471,782
16 unique multiplications The final answer:
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