Q: What is the sum of all factors of the number 690 excluding 690?

 A: 1,038

Why is 1,038 the sum of all factors of 690, excluding 690?

The factors of the number 690 are: 1, 2, 3, 5, 6, 10, 15, 23, 30, 46, 69, 115, 138, 230, 345, 690.

If you add them up, you will get the total of 691. Now subtract 690 to get 1,038


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