Q: What are the prime factors of the number 31,305,024?

 A: 2, 3, 17, 23, 139

Why are those the prime factors of the number 31,305,024?

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 31,305,024

31,305,024
Factor Arrows
215,652,512
Factor Arrows
27,826,256
Factor Arrows
23,913,128
Factor Arrows
21,956,564
Factor Arrows
2978,282
Factor Arrows
2489,141
Factor Arrows
3163,047
Factor Arrows
354,349
Factor Arrows
173,197
Factor Arrows
23139

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, 23, 139

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 3 x 3 x 17 x 23 x 139 = 31,305,024

This can also be written as 26 x 32 x 171 x 231 x 1391 = 31,305,024

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


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