The sum of powers of even divisors of a number. It is the analog of the divisor function
for even divisors only and is written 
. It is given simply in terms of the usual divisor function by
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(1)
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Even Divisor Function
See also
Divisor Function, Odd Divisor FunctionExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Even Divisor Function." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/EvenDivisorFunction.html