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|---|---|---|---|---|
| Cardinal | twenty thousand | |||
| Ordinal | 20000th (twenty thousandth) |
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| Factorization | 25× 54 | |||
| Roman numeral | XX | |||
| Binary | 1001110001000002 | |||
| Ternary | 10001022023 | |||
| Quaternary | 103202004 | |||
| Quinary | 11200005 | |||
| Senary | 2323326 | |||
| Octal | 470408 | |||
| Duodecimal | B6A812 | |||
| Hexadecimal | 4E2016 | |||
| Vigesimal | 2A0020 | |||
| Base 36 | FFK36 | |||
20 000 (twenty thousand) is the natural number that comes after 19,999 and before 20,001.