Publications de l'Institut Mathématique, Nouvelle Série Vol. 97(111), pp. 175–180 (2015) 

THE SUM OF THE UNITARY DIVISOR FUNCTIONTim TrudgianMathematical Sciences Institute, The Australian National University, Canberra, AustraliaAbstract: We establish a new upper bound on the function $\sigma^*(n)$, the sum of all coprime divisors of $n$. The main result is that $\sigma^*(n)\leq 1.3007 n\log\log n$ for all $n\geq 570 571$. Keywords: unitary divisors; exponential divisors; arithmetic functions Classification (MSC2000): 11A25; 11N56 Full text of the article: (for faster download, first choose a mirror)
Electronic fulltext finalized on: 16 Apr 2015. This page was last modified: 21 Apr 2015.
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