On a Sum Involving the Sum-of-Divisors Function by Feng Zhao, Jie Wu

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Arithmatical consequences of two identities of B. Gordon by John A. Ewell

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Even perfect numbers and their Euler's function by Syed Asadulla

Subjects: “…perfect number; triangular number; Euler's function; number of divisors function.…”
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On a function related to Ramanujan's Tau function by John A. Ewell

“…The simpler of these two formulas is expressed solely in terms of the well-known sum-of-divisors function.…”
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Some characterizations of specially multiplicative functions by Pentti Haukkanen

“…For example, the divisor functions and Ramanujan's τ-function are specially multiplicative functions. …”
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Ramanujan sums via generalized Möbius functions and applications by Vichian Laohakosol, Pattira Ruengsinsub, Nittiya Pabhapote

“…The third establishes analogues of the remarkable Ramanujan's formulae connecting divisor functions with Ramanujan sums. The fourth gives a formula for the inverse of a GRS. …”
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