Under each blue number bar, its factors other than the number itself are laid end to end. A number is perfect when these factors add up to exactly the number. For the number in the picture that is NOT perfect, by how much does its factor row go past its bar?

Question

Accepted Answer

2. 6: 1 + 2 + 3 = 6 and 28: 1 + 2 + 4 + 7 + 14 = 28 , so both are perfect. 20: 1 + 2 + 4 + 5 + 10 = 22 , which is 22 - 20 = 2 more than 20.

Under each blue number bar, its factors other than the number itself are laid end to end. A number is perfect when these factors add up to exactly the number. For the number in the picture that is NOT perfect, by how much does its factor row go past its bar?

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