Q: What is the sum of all factors of the number 171 excluding 171?

 A: 89

Why is 89 the sum of all factors of 171, excluding 171?

The factors of the number 171 are: 1, 3, 9, 19, 57, 171.

If you add them up, you will get the total of 260. Now subtract 171 to get 89


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