9. The sum of the first $n$ terms of an arithmetic sequence is 2000, the common difference is 2, the first term is an integer, and $n>1$, the sum of all possible values of $n$ is $\qquad$ .
9. 4835 .
$$
\begin{array}{l}
S_{n}=\frac{n\left(a_{1}+a_{n}\right)}{2}=n\left(a_{1}+n-1\right)=2000=2^{4} \times 5^{3} \text {, so the required value is }(1+5+25+125) \times \\
(1+2+4+8+16)-1=4835 .
\end{array}
$$