Q: What is the sum of all factors of the number 640,021 excluding 640,021?

 A: 27,851

Why is 27,851 the sum of all factors of 640,021, excluding 640,021?

The factors of the number 640,021 are: 1, 23, 27827, 640021.

If you add them up, you will get the total of 640,048. Now subtract 640,021 to get 27,851


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