How do you spell Twenty

Available Definitions:
1)  a. - One more that nineteen; twice; as, twenty men.
2)  a. - An indefinite number more or less that twenty.
3)  n. - The number next following nineteen; the sum of twelve and eight, or twice ten; twenty units or objects; a score.
4)  n. - A symbol representing twenty units, as 20, or xx.