An even perfect number is perfect number that is even, i.e., an even number whose sum of divisors (including itself) equals .
All known perfect numbers are even, and Ochem and Rao (2012) have shown that any odd perfect number must be larger than .
An even perfect number is perfect number that is even, i.e., an even number whose sum of divisors (including itself) equals .
All known perfect numbers are even, and Ochem and Rao (2012) have shown that any odd perfect number must be larger than .
Weisstein, Eric W. "Even Perfect Number." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/EvenPerfectNumber.html