Q: What are the prime factors of the number 204,655,360?

 A: 2, 5, 7, 13, 251

Why are those the prime factors of the number 204,655,360?

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 204,655,360

204,655,360
Factor Arrows
2102,327,680
Factor Arrows
251,163,840
Factor Arrows
225,581,920
Factor Arrows
212,790,960
Factor Arrows
26,395,480
Factor Arrows
23,197,740
Factor Arrows
21,598,870
Factor Arrows
2799,435
Factor Arrows
5159,887
Factor Arrows
722,841
Factor Arrows
73,263
Factor Arrows
13251

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, 5, 7, 13, 251

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 5 x 7 x 7 x 13 x 251 = 204,655,360

This can also be written as 28 x 51 x 72 x 131 x 2511 = 204,655,360

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


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