Q: What is the sum of all factors of the number 39,890 excluding 39,890?

 A: 31,930

Why is 31,930 the sum of all factors of 39,890, excluding 39,890?

The factors of the number 39,890 are: 1, 2, 5, 10, 3989, 7978, 19945, 39890.

If you add them up, you will get the total of 39,921. Now subtract 39,890 to get 31,930


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