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How to type Chinese numbers like 九 (for number 9), 二十 (for number 20) on computer keyboard?
On Windows 10:
Windows key > Settings > Time and language > Language > Add a Language > 日本語
From there it's pretty simple. Just click on "ENG" on the right side of the taskbar near the clock, and pick Japanese. Once you see the "あ," you can type romaji and it shows up as Japanese.
Depending on the IME, there are multiple ways of entering a number in kanji:
Example for Google Japanese IME (in Hiragana mode):