Q: What is the sum of all factors of the number 900 excluding 900?

 A: 1,921

Why is 1,921 the sum of all factors of 900, excluding 900?

The factors of the number 900 are: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 25, 30, 36, 45, 50, 60, 75, 90, 100, 150, 180, 225, 300, 450, 900.

If you add them up, you will get the total of 901. Now subtract 900 to get 1,921


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