Q: What is the sum of all factors of the number 1,242 excluding 1,242?
A: 1,638
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