Q: What are the prime factors of the number 23,133,440?

 A: 2, 5, 11, 31, 53

Why are those the prime factors of the number 23,133,440?

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 23,133,440

23,133,440
Factor Arrows
211,566,720
Factor Arrows
25,783,360
Factor Arrows
22,891,680
Factor Arrows
21,445,840
Factor Arrows
2722,920
Factor Arrows
2361,460
Factor Arrows
2180,730
Factor Arrows
290,365
Factor Arrows
518,073
Factor Arrows
111,643
Factor Arrows
3153

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, 11, 31, 53

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 2 x 5 x 11 x 31 x 53 = 23,133,440

This can also be written as 28 x 51 x 111 x 311 x 531 = 23,133,440

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


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