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DivisorSigma
DivisorSigma[k, n] gives the divisor function .
Integer mathematical function (see Section A.3.10).
 is the sum of the  powers of the divisors of .
DivisorSigma[k, n, GaussianIntegers -> True] includes divisors that are Gaussian integers.
See The Mathematica Book: Section 3.2.4.
See also: EulerPhi.
Further Examples
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