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Let $\ba=(a_1,a_2,\ldots,a_k)$, where $a_j \ (j=1,\ldots,k)$ are positiveintegers such that $a_1 \leq a_2 \leq \cdots \leq a_k$. Let$d(\ba;n)=\sum_{n_1^{a_1}\cdots n_k^{a_k}=n}1$ and $\Delta(\ba;x)$ be the errorterm of the summatory function of $d(\ba;n)$. In this paper we show anasymptotic formula of the mean square of $\Delta(\ba;x)$ under a certaincondition. Furthermore, in the cases $k=2$ and 3, we give unconditionalasymptotic formulas for these mean squares.

Mean square of the error term in the asymmetric many dimensional divisor problem