Q: What are the prime factors of the number 39,202,240?

 A: 2, 5, 7, 11, 37, 43

Why are those the prime factors of the number 39,202,240?

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 39,202,240

39,202,240
Factor Arrows
219,601,120
Factor Arrows
29,800,560
Factor Arrows
24,900,280
Factor Arrows
22,450,140
Factor Arrows
21,225,070
Factor Arrows
2612,535
Factor Arrows
5122,507
Factor Arrows
717,501
Factor Arrows
111,591
Factor Arrows
3743

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, 11, 37, 43

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 5 x 7 x 11 x 37 x 43 = 39,202,240

This can also be written as 26 x 51 x 71 x 111 x 371 x 431 = 39,202,240

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


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