Q: What are the prime factors of the number 18,332,160?

 A: 2, 3, 5, 7, 11, 31

Why are those the prime factors of the number 18,332,160?

Prime factors are the prime numbers that can be multipled together to equal the original number. You find the factors by dividing by prime numbers. It is best shown by creating a Factor Tree.

Factor Tree for the number 18,332,160

18,332,160
Factor Arrows
29,166,080
Factor Arrows
24,583,040
Factor Arrows
22,291,520
Factor Arrows
21,145,760
Factor Arrows
2572,880
Factor Arrows
2286,440
Factor Arrows
2143,220
Factor Arrows
271,610
Factor Arrows
235,805
Factor Arrows
311,935
Factor Arrows
52,387
Factor Arrows
7341
Factor Arrows
1131

The numbers in bold above are the prime factors. If there are multiples, you only count them one time. This leads us to our prime factors of:

2, 3, 5, 7, 11, 31

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 3 x 5 x 7 x 11 x 31 = 18,332,160

This can also be written as 29 x 31 x 51 x 71 x 111 x 311 = 18,332,160

If you would like to know more, or need additional explanation, please review our prime factorization explanation.


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