Q: What is the sum of all factors of the number 261 excluding 261?

 A: 129

Why is 129 the sum of all factors of 261, excluding 261?

The factors of the number 261 are: 1, 3, 9, 29, 87, 261.

If you add them up, you will get the total of 390. Now subtract 261 to get 129


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