Q: What are the prime factors of the number 20,643,521?

Why are those the prime factors of the number 20,643,521?

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 20,643,521

	20,643,521
37		557,933
	563		991

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:

37, 563, 991

We can check our work by multiplying all of the prime factors together: 37 x 563 x 991 = 20,643,521

This can also be written as 37¹ x 563¹ x 991¹ = 20,643,521

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

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