To find all the divisors of the number 499,485:
- 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 499,485:
The prime factorization of a number: finding the prime numbers that multiply together to make that number.
499,485 = 3 × 5 × 7 × 67 × 71
499,485 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 499,485
- 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 =
3
prime factor =
5
prime factor =
7
composite factor = 3 × 5 =
15
composite factor = 3 × 7 =
21
composite factor = 5 × 7 =
35
prime factor =
67
prime factor =
71
composite factor = 3 × 5 × 7 =
105
composite factor = 3 × 67 =
201
composite factor = 3 × 71 =
213
composite factor = 5 × 67 =
335
composite factor = 5 × 71 =
355
composite factor = 7 × 67 =
469
composite factor = 7 × 71 =
497
This list continues below...
... This list continues from above
composite factor = 3 × 5 × 67 =
1,005
composite factor = 3 × 5 × 71 =
1,065
composite factor = 3 × 7 × 67 =
1,407
composite factor = 3 × 7 × 71 =
1,491
composite factor = 5 × 7 × 67 =
2,345
composite factor = 5 × 7 × 71 =
2,485
composite factor = 67 × 71 =
4,757
composite factor = 3 × 5 × 7 × 67 =
7,035
composite factor = 3 × 5 × 7 × 71 =
7,455
composite factor = 3 × 67 × 71 =
14,271
composite factor = 5 × 67 × 71 =
23,785
composite factor = 7 × 67 × 71 =
33,299
composite factor = 3 × 5 × 67 × 71 =
71,355
composite factor = 3 × 7 × 67 × 71 =
99,897
composite factor = 5 × 7 × 67 × 71 =
166,495
composite factor = 3 × 5 × 7 × 67 × 71 =
499,485
32 factors (divisors)
What times what is 499,485?
What number multiplied by what number equals 499,485?
All the combinations of any two natural numbers whose product equals 499,485.
1 × 499,485 = 499,485
3 × 166,495 = 499,485
5 × 99,897 = 499,485
7 × 71,355 = 499,485
15 × 33,299 = 499,485
21 × 23,785 = 499,485
35 × 14,271 = 499,485
67 × 7,455 = 499,485
71 × 7,035 = 499,485
105 × 4,757 = 499,485
201 × 2,485 = 499,485
213 × 2,345 = 499,485
335 × 1,491 = 499,485
355 × 1,407 = 499,485
469 × 1,065 = 499,485
497 × 1,005 = 499,485
16 unique multiplications The final answer:
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