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(4) A number in which the sum of all its proper factors is equal to the number itself. Example: 6 is a perfect number because when you add its proper factors the answer is equal to 6: 1 + 2 + 3 = 6.
A number whose proper factors sum up to the number itself. For example, the proper factors of 6 are 1, 2, and 3, which sum to 6.
an integer greater than zero whose factors less than the number all add up to the number (i
an integer n such that the sum of the proper divisors of n is equal to n
an integer such that the sum of its own divisors is twice the number
an integer that equals the sum of its proper divisors
a number (an integer ) for which the sum of its proper factors (divisors) is equal to the number itself
a number that all of its factors excluding itself add up to the number
a number that is equal to the sum of all of its (positive) divisors, excluding itself
a number that is equal to the sum of its proper factors -- that is, all the positive numbers less than the number itself, that divide evenly into the number
a number that is numerically equal to the sum of its divisors, i
a number which has all its integer factors added together to result in the source number
a number whose divisors sum to twice itself
a number whose factors, including the number itself, sum up to twice the number
a number who's factors sum up to the number itself
a number with factors which, when added together, add up to te number