Q: What are the prime factors of the number 22,977,920?

 A: 2, 5, 7, 23, 223

Why are those the prime factors of the number 22,977,920?

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 22,977,920

22,977,920
Factor Arrows
211,488,960
Factor Arrows
25,744,480
Factor Arrows
22,872,240
Factor Arrows
21,436,120
Factor Arrows
2718,060
Factor Arrows
2359,030
Factor Arrows
2179,515
Factor Arrows
535,903
Factor Arrows
75,129
Factor Arrows
23223

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, 23, 223

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 5 x 7 x 23 x 223 = 22,977,920

This can also be written as 27 x 51 x 71 x 231 x 2231 = 22,977,920

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


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