Q: What are the prime factors of the number 18,981,660?

 A: 2, 3, 5, 29, 10909

Why are those the prime factors of the number 18,981,660?

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 18,981,660

18,981,660
Factor Arrows
29,490,830
Factor Arrows
24,745,415
Factor Arrows
31,581,805
Factor Arrows
5316,361
Factor Arrows
2910,909

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, 29, 10909

We can check our work by multiplying all of the prime factors together: 2 x 2 x 3 x 5 x 29 x 10,909 = 18,981,660

This can also be written as 22 x 31 x 51 x 291 x 10,9091 = 18,981,660

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


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