Q: What is the sum of all factors of the number 640,903 excluding 640,903?

 A: 1,977

Why is 1,977 the sum of all factors of 640,903, excluding 640,903?

The factors of the number 640,903 are: 1, 409, 1567, 640903.

If you add them up, you will get the total of 640,904. Now subtract 640,903 to get 1,977


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