Q: What is the sum of all factors of the number 660 excluding 660?

 A: 1,356

Why is 1,356 the sum of all factors of 660, excluding 660?

The factors of the number 660 are: 1, 2, 3, 4, 5, 6, 10, 11, 12, 15, 20, 22, 30, 33, 44, 55, 60, 66, 110, 132, 165, 220, 330, 660.

If you add them up, you will get the total of 661. Now subtract 660 to get 1,356


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