Q: What is the sum of all factors of the number 3,105 excluding 3,105?

A: 2,655

Why is 2,655 the sum of all factors of 3,105, excluding 3,105?

The factors of the number 3,105 are: 1, 3, 5, 9, 15, 23, 27, 45, 69, 115, 135, 207, 345, 621, 1035, 3105.

If you add them up, you will get the total of 3,107. Now subtract 3,105 to get 2,655

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