Q: What is the sum of all factors of the number 945 excluding 945?

 A: 975

Why is 975 the sum of all factors of 945, excluding 945?

The factors of the number 945 are: 1, 3, 5, 7, 9, 15, 21, 27, 35, 45, 63, 105, 135, 189, 315, 945.

If you add them up, you will get the total of 1,920. Now subtract 945 to get 975


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