To find all the divisors of the number 485,814:
- 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 485,814:
The prime factorization of a number: finding the prime numbers that multiply together to make that number.
485,814 = 2 × 3 × 7 × 43 × 269
485,814 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 485,814
- 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
composite factor = 2 × 3 × 7 =
42
prime factor =
43
composite factor = 2 × 43 =
86
composite factor = 3 × 43 =
129
composite factor = 2 × 3 × 43 =
258
prime factor =
269
composite factor = 7 × 43 =
301
composite factor = 2 × 269 =
538
composite factor = 2 × 7 × 43 =
602
This list continues below...
... This list continues from above
composite factor = 3 × 269 =
807
composite factor = 3 × 7 × 43 =
903
composite factor = 2 × 3 × 269 =
1,614
composite factor = 2 × 3 × 7 × 43 =
1,806
composite factor = 7 × 269 =
1,883
composite factor = 2 × 7 × 269 =
3,766
composite factor = 3 × 7 × 269 =
5,649
composite factor = 2 × 3 × 7 × 269 =
11,298
composite factor = 43 × 269 =
11,567
composite factor = 2 × 43 × 269 =
23,134
composite factor = 3 × 43 × 269 =
34,701
composite factor = 2 × 3 × 43 × 269 =
69,402
composite factor = 7 × 43 × 269 =
80,969
composite factor = 2 × 7 × 43 × 269 =
161,938
composite factor = 3 × 7 × 43 × 269 =
242,907
composite factor = 2 × 3 × 7 × 43 × 269 =
485,814
32 factors (divisors)
What times what is 485,814?
What number multiplied by what number equals 485,814?
All the combinations of any two natural numbers whose product equals 485,814.
1 × 485,814 = 485,814
2 × 242,907 = 485,814
3 × 161,938 = 485,814
6 × 80,969 = 485,814
7 × 69,402 = 485,814
14 × 34,701 = 485,814
21 × 23,134 = 485,814
42 × 11,567 = 485,814
43 × 11,298 = 485,814
86 × 5,649 = 485,814
129 × 3,766 = 485,814
258 × 1,883 = 485,814
269 × 1,806 = 485,814
301 × 1,614 = 485,814
538 × 903 = 485,814
602 × 807 = 485,814
16 unique multiplications The final answer:
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