Q: What are the prime factors of the number 100,503,520?

 A: 2, 5, 13, 211, 229

Why are those the prime factors of the number 100,503,520?

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 100,503,520

100,503,520
Factor Arrows
250,251,760
Factor Arrows
225,125,880
Factor Arrows
212,562,940
Factor Arrows
26,281,470
Factor Arrows
23,140,735
Factor Arrows
5628,147
Factor Arrows
1348,319
Factor Arrows
211229

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, 13, 211, 229

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 5 x 13 x 211 x 229 = 100,503,520

This can also be written as 25 x 51 x 131 x 2111 x 2291 = 100,503,520

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


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