Q: What is the sum of all factors of the number 151,991 excluding 151,991?

 A: 21,721

Why is 21,721 the sum of all factors of 151,991, excluding 151,991?

The factors of the number 151,991 are: 1, 7, 21713, 151991.

If you add them up, you will get the total of 152,012. Now subtract 151,991 to get 21,721


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