Q: What is the sum of all factors of the number 165 excluding 165?

 A: 123

Why is 123 the sum of all factors of 165, excluding 165?

The factors of the number 165 are: 1, 3, 5, 11, 15, 33, 55, 165.

If you add them up, you will get the total of 288. Now subtract 165 to get 123


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