To find all the divisors of the number 11,340:
- 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 11,340:
The prime factorization of a number: finding the prime numbers that multiply together to make that number.
11,340 = 22 × 34 × 5 × 7
11,340 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) × (1 + 1) = 3 × 5 × 2 × 2 = 60
But to actually calculate the factors, see below...
2. Multiply the prime factors of the number 11,340
- 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
prime factor =
3
composite factor = 2
2 =
4
prime factor =
5
composite factor = 2 × 3 =
6
prime factor =
7
composite factor = 3
2 =
9
composite factor = 2 × 5 =
10
composite factor = 2
2 × 3 =
12
composite factor = 2 × 7 =
14
composite factor = 3 × 5 =
15
composite factor = 2 × 3
2 =
18
composite factor = 2
2 × 5 =
20
composite factor = 3 × 7 =
21
composite factor = 3
3 =
27
composite factor = 2
2 × 7 =
28
composite factor = 2 × 3 × 5 =
30
composite factor = 5 × 7 =
35
composite factor = 2
2 × 3
2 =
36
composite factor = 2 × 3 × 7 =
42
composite factor = 3
2 × 5 =
45
composite factor = 2 × 3
3 =
54
composite factor = 2
2 × 3 × 5 =
60
composite factor = 3
2 × 7 =
63
composite factor = 2 × 5 × 7 =
70
composite factor = 3
4 =
81
composite factor = 2
2 × 3 × 7 =
84
composite factor = 2 × 3
2 × 5 =
90
composite factor = 3 × 5 × 7 =
105
This list continues below...
... This list continues from above
composite factor = 2
2 × 3
3 =
108
composite factor = 2 × 3
2 × 7 =
126
composite factor = 3
3 × 5 =
135
composite factor = 2
2 × 5 × 7 =
140
composite factor = 2 × 3
4 =
162
composite factor = 2
2 × 3
2 × 5 =
180
composite factor = 3
3 × 7 =
189
composite factor = 2 × 3 × 5 × 7 =
210
composite factor = 2
2 × 3
2 × 7 =
252
composite factor = 2 × 3
3 × 5 =
270
composite factor = 3
2 × 5 × 7 =
315
composite factor = 2
2 × 3
4 =
324
composite factor = 2 × 3
3 × 7 =
378
composite factor = 3
4 × 5 =
405
composite factor = 2
2 × 3 × 5 × 7 =
420
composite factor = 2
2 × 3
3 × 5 =
540
composite factor = 3
4 × 7 =
567
composite factor = 2 × 3
2 × 5 × 7 =
630
composite factor = 2
2 × 3
3 × 7 =
756
composite factor = 2 × 3
4 × 5 =
810
composite factor = 3
3 × 5 × 7 =
945
composite factor = 2 × 3
4 × 7 =
1,134
composite factor = 2
2 × 3
2 × 5 × 7 =
1,260
composite factor = 2
2 × 3
4 × 5 =
1,620
composite factor = 2 × 3
3 × 5 × 7 =
1,890
composite factor = 2
2 × 3
4 × 7 =
2,268
composite factor = 3
4 × 5 × 7 =
2,835
composite factor = 2
2 × 3
3 × 5 × 7 =
3,780
composite factor = 2 × 3
4 × 5 × 7 =
5,670
composite factor = 2
2 × 3
4 × 5 × 7 =
11,340
60 factors (divisors)
What times what is 11,340?
What number multiplied by what number equals 11,340?
All the combinations of any two natural numbers whose product equals 11,340.
1 × 11,340 = 11,340
2 × 5,670 = 11,340
3 × 3,780 = 11,340
4 × 2,835 = 11,340
5 × 2,268 = 11,340
6 × 1,890 = 11,340
7 × 1,620 = 11,340
9 × 1,260 = 11,340
10 × 1,134 = 11,340
12 × 945 = 11,340
14 × 810 = 11,340
15 × 756 = 11,340
18 × 630 = 11,340
20 × 567 = 11,340
21 × 540 = 11,340
27 × 420 = 11,340
28 × 405 = 11,340
30 × 378 = 11,340
35 × 324 = 11,340
36 × 315 = 11,340
42 × 270 = 11,340
45 × 252 = 11,340
54 × 210 = 11,340
60 × 189 = 11,340
63 × 180 = 11,340
70 × 162 = 11,340
81 × 140 = 11,340
84 × 135 = 11,340
90 × 126 = 11,340
105 × 108 = 11,340
30 unique multiplications The final answer:
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