Q: What is the sum of all factors of the number 18 excluding 18?

 A: 21

Why is 21 the sum of all factors of 18, excluding 18?

The factors of the number 18 are: 1, 2, 3, 6, 9, 18.

If you add them up, you will get the total of 39. Now subtract 18 to get 21


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