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Q: What number between 20 and 30 has a sum of all its proper factors equal to twice the number itself?

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The factors of a number include 1 and the number itself. The proper factors do not.

The proper factors are the regular factors without one and the number itself.

Proper factors do not include one and the number itself.

the proper factors are the factors of a number not including the number itself, or 1.

"Proper factors" are all of a number's factors except one and the number itself.

The proper factors of a number do not include one and the number itself.

Proper factors don't include one and the number itself.

Proper factors don't include one and the number itself.

Proper factors are factors of the number except the number itself. So, with that said, the proper factors of 38 are 1, 2, and 19.

Abundant is a number for which the sum of all its proper factors is greater than the number itself. Deficient is a number for which the sum of all its proper factors is less than the number itself. Perfect is a number for which the sum of all its proper factors is the number itself.

Proper factors don't include one and the number itself.

The set of proper factors doesn't include 1 and the number itself.

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