25 + 25 = 50
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1022
zero + zero = zero
There is no two digit number which, when added to Y gives Y.
101117
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.