To find all the divisors of the number 1,740,725:
- 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 1,740,725:
The prime factorization of a number: finding the prime numbers that multiply together to make that number.
1,740,725 = 52 × 74 × 29
1,740,725 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 = (2 + 1) × (4 + 1) × (1 + 1) = 3 × 5 × 2 = 30
But to actually calculate the factors, see below...
2. Multiply the prime factors of the number 1,740,725
- 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 =
5
prime factor =
7
composite factor = 5
2 =
25
prime factor =
29
composite factor = 5 × 7 =
35
composite factor = 7
2 =
49
composite factor = 5 × 29 =
145
composite factor = 5
2 × 7 =
175
composite factor = 7 × 29 =
203
composite factor = 5 × 7
2 =
245
composite factor = 7
3 =
343
composite factor = 5
2 × 29 =
725
composite factor = 5 × 7 × 29 =
1,015
composite factor = 5
2 × 7
2 =
1,225
This list continues below...
... This list continues from above
composite factor = 7
2 × 29 =
1,421
composite factor = 5 × 7
3 =
1,715
composite factor = 7
4 =
2,401
composite factor = 5
2 × 7 × 29 =
5,075
composite factor = 5 × 7
2 × 29 =
7,105
composite factor = 5
2 × 7
3 =
8,575
composite factor = 7
3 × 29 =
9,947
composite factor = 5 × 7
4 =
12,005
composite factor = 5
2 × 7
2 × 29 =
35,525
composite factor = 5 × 7
3 × 29 =
49,735
composite factor = 5
2 × 7
4 =
60,025
composite factor = 7
4 × 29 =
69,629
composite factor = 5
2 × 7
3 × 29 =
248,675
composite factor = 5 × 7
4 × 29 =
348,145
composite factor = 5
2 × 7
4 × 29 =
1,740,725
30 factors (divisors)
What times what is 1,740,725?
What number multiplied by what number equals 1,740,725?
All the combinations of any two natural numbers whose product equals 1,740,725.
1 × 1,740,725 = 1,740,725
5 × 348,145 = 1,740,725
7 × 248,675 = 1,740,725
25 × 69,629 = 1,740,725
29 × 60,025 = 1,740,725
35 × 49,735 = 1,740,725
49 × 35,525 = 1,740,725
145 × 12,005 = 1,740,725
175 × 9,947 = 1,740,725
203 × 8,575 = 1,740,725
245 × 7,105 = 1,740,725
343 × 5,075 = 1,740,725
725 × 2,401 = 1,740,725
1,015 × 1,715 = 1,740,725
1,225 × 1,421 = 1,740,725
15 unique multiplications The final answer:
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