There aren't any numbers like that. You might be thinking of 28, which has a sum of all its factors equal to twice itself, making it a perfect number. Proper factors are a different set.
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 set of factors includes one and the number itself. Proper factors do not include those two.
The proper factors of a number do not include one and the number itself.
Proper factors don't include one and the number itself.
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 occur when you list all the factors of a number except for 1 and the number itself. Common factors occur when you compare a minimum of two sets of factors and see which ones they share.
Proper factors don't include one and the number itself.
The set of proper factors doesn't include 1 and the number itself.
The proper factors of 64 are 2, 4, 8, 16 and 32. For proper factors of a number exclude 1 and the number itself from the list of factors.