Q: What is the sum of all factors of the number 39,990 excluding 39,990?

 A: 61,386

Why is 61,386 the sum of all factors of 39,990, excluding 39,990?

The factors of the number 39,990 are: 1, 2, 3, 5, 6, 10, 15, 30, 31, 43, 62, 86, 93, 129, 155, 186, 215, 258, 310, 430, 465, 645, 930, 1290, 1333, 2666, 3999, 6665, 7998, 13330, 19995, 39990.

If you add them up, you will get the total of 40,051. Now subtract 39,990 to get 61,386


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