Q: What is the sum of all factors of the number 81,990 excluding 81,990?

 A: 131,418

Why is 131,418 the sum of all factors of 81,990, excluding 81,990?

The factors of the number 81,990 are: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90, 911, 1822, 2733, 4555, 5466, 8199, 9110, 13665, 16398, 27330, 40995, 81990.

If you add them up, you will get the total of 82,121. Now subtract 81,990 to get 131,418


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