19 (number)

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18 19 20
Cardinal nineteen
Ordinal 19th
(nineteenth)
Factorization prime
Prime 8th
Divisors 1, 19
Roman numeral XIX
Binary 100112
Ternary 2013
Quaternary 1034
Quinary 345
Senary 316
Octal 238
Duodecimal 1712
Hexadecimal 1316
Vigesimal J20
Base 36 J36

Nineteen is a number. It comes between eighteen and twenty, and is an odd number. It is also the 8th prime number, after 2, 3, 5, 7, 11, 13, and 17.

In Roman numerals, 19 is written as XIX.