2 x 2 x 2 x 2 x 23 x 47 = 17,296
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The proper factors of 220 are 2,4,5,10,11,20,22,44,55,110
The proper factors of 16 are 1,2,4, and 8 :)
Prime numbers don't have proper factors.
1, 5, 7, and 35 are the factors of 35. The proper factors are 5 and 7.
13 is a prime number so the only factors are 1 and itself. Prime numbers have no proper factors.