Any multiple of 9. In other words, any number of the form 9 * n.
Add the digits of the number. If that total is divisible by nine, so is the original number. Example: 12,345,678. The digits total 36. 36 is divisible by 9. So is 12,345,678.
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3 and 9.
The numbers that divide evenly into 18 are 1, 2, 3, 6, 9, 18, and the negative of each of those.
1 3 9 11 33 and 99.
1, 2, 4, 5, 10, and 20 divide evenly into 20.
1 and 13