Q: What are the prime factors of the number 120,341,520?

 A: 2, 3, 5, 13, 23, 43

Why are those the prime factors of the number 120,341,520?

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 120,341,520

120,341,520
Factor Arrows
260,170,760
Factor Arrows
230,085,380
Factor Arrows
215,042,690
Factor Arrows
27,521,345
Factor Arrows
32,507,115
Factor Arrows
3835,705
Factor Arrows
5167,141
Factor Arrows
1312,857
Factor Arrows
13989
Factor Arrows
2343

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, 13, 23, 43

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 3 x 3 x 5 x 13 x 13 x 23 x 43 = 120,341,520

This can also be written as 24 x 32 x 51 x 132 x 231 x 431 = 120,341,520

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


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