Q: What are the prime factors of the number 20,635,008?

 A: 2, 3, 17, 29, 109

Why are those the prime factors of the number 20,635,008?

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 20,635,008

20,635,008
Factor Arrows
210,317,504
Factor Arrows
25,158,752
Factor Arrows
22,579,376
Factor Arrows
21,289,688
Factor Arrows
2644,844
Factor Arrows
2322,422
Factor Arrows
2161,211
Factor Arrows
353,737
Factor Arrows
173,161
Factor Arrows
29109

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, 17, 29, 109

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 3 x 17 x 29 x 109 = 20,635,008

This can also be written as 27 x 31 x 171 x 291 x 1091 = 20,635,008

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


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