Q: What is the sum of all factors of the number 4,005 excluding 4,005?

A: 3,015

Why is 3,015 the sum of all factors of 4,005, excluding 4,005?

The factors of the number 4,005 are: 1, 3, 5, 9, 15, 45, 89, 267, 445, 801, 1335, 4005.

If you add them up, you will get the total of 4,008. Now subtract 4,005 to get 3,015

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