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Cardinal | eighteen | |||
Ordinal | 18th (eighteenth) | |||
Numeral system | octodecimal | |||
Factorization | 2 × 32 | |||
Divisors | 1, 2, 3, 6, 9, 18 | |||
Greek numeral | ΙΗ´ | |||
Roman numeral | XVIII | |||
Binary | 100102 | |||
Ternary | 2003 | |||
Senary | 306 | |||
Octal | 228 | |||
Duodecimal | 1612 | |||
Hexadecimal | 1216 | |||
Hebrew numeral | י"ח | |||
Babylonian numeral | 𒌋𒐜 |
18 (eighteen) is the natural number following 17 and preceding 19.
In most countries, 18 is the age of majority, in which a minor becomes a legal adult. It is also the voting age, marriageable age, drinking age and smoking age in most countries, though sometimes these ages are different than the age of majority. Many websites restrict adult content to visitors who claim to be aged over 18.
10 (ten) is the even natural number following 9 and preceding 11. Ten is the base of the decimal numeral system, the most common system of denoting numbers in both spoken and written language.
21 (twenty-one) is the natural number following 20 and preceding 22.
30 (thirty) is the natural number following 29 and preceding 31.
60 (sixty) is the natural number following 59 and preceding 61. Being three times 20, it is called threescore in older literature.
90 (ninety) is the natural number following 89 and preceding 91.
72 (seventy-two) is the natural number following 71 and preceding 73. It is half a gross or 6 dozen.
84 (eighty-four) is the natural number following 83 and preceding 85.
36 (thirty-six) is the natural number following 35 and preceding 37.
48 (forty-eight) is the natural number following 47 and preceding 49. It is four dozens or one third of a gross.
56 (fifty-six) is the natural number following 55 and preceding 57.
57 (fifty-seven) is the natural number following 56 and preceding 58.
66 (sixty-six) is the natural number following 65 and preceding 67.
104 is the natural number following 103 and preceding 105.
100 or one hundred is the natural number following 99 and preceding 101.
100,000 (one hundred thousand) is the natural number following 99,999 and preceding 100,001. In scientific notation, it is written as 105.
777 is the natural number following 776 and preceding 778. The number 777 is significant in numerous religious and political contexts.
1728 is the natural number following 1727 and preceding 1729. It is a dozen gross, or one great gross. It is also the number of cubic inches in a cubic foot.
240 is the natural number following 239 and preceding 241.
206 is the natural number following 205 and preceding 207.
304 is the natural number following 303 and preceding 305.