Q: What is the sum of all factors of the number 1,242 excluding 1,242?

 A: 1,638

Why is 1,638 the sum of all factors of 1,242, excluding 1,242?

The factors of the number 1,242 are: 1, 2, 3, 6, 9, 18, 23, 27, 46, 54, 69, 138, 207, 414, 621, 1242.

If you add them up, you will get the total of 1,243. Now subtract 1,242 to get 1,638


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