A unitary perfect number is an integer which is the sum of its positive proper unitary divisors, not including the number itself. (A divisor d of a number n is a unitary divisor if d and n/d share no common factors.) The number 6 is the only number that is both a perfect number and a unitary perfect number.
A unitary perfect number is an integer which is the sum of its positive proper unitary divisors, not including the number itself. (A divisor d of a number n is a unitary divisor if d and n/d share no common factors.) The number 6 is the only number that is both a perfect number and a unitary perfect number.
Source: Wikipedia "Unitary perfect number" · CC BY-SA 4.0
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