Q: What is the sum of all factors of the number 531,991 excluding 531,991?

 A: 21,385

Why is 21,385 the sum of all factors of 531,991, excluding 531,991?

The factors of the number 531,991 are: 1, 31, 131, 4061, 17161, 531991.

If you add them up, you will get the total of 532,012. Now subtract 531,991 to get 21,385


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