Q: What is the sum of all factors of the number 1,305 excluding 1,305?

 A: 1,035

Why is 1,035 the sum of all factors of 1,305, excluding 1,305?

The factors of the number 1,305 are: 1, 3, 5, 9, 15, 29, 45, 87, 145, 261, 435, 1305.

If you add them up, you will get the total of 1,306. Now subtract 1,305 to get 1,035


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