18 (number) From Wikipedia, the free encyclopedia (Redirected from 18th) Jump to: navigation, search 18 10 8 18 (eighteen) is the natural number following 17 and preceding 19. 10 11 12 13 14 15 16 17 18 19 List of numbers � Integers 0 10 20 30 40 50 60 70 80 90 Cardinal 18 eighteen Ordinal 18th eighteenth Factorization Divisors 1, 2, 3, 6, 9, 18 Roman numeral XVIII Roman numeral (Unicode) XVIII, xviii Binary 10010 Octal 22 Duodecimal 16 Hexadecimal 12 Look up eighteen in Wiktionary, the free dictionary.Contents 1 In mathematics 2 In science 2.1 Astronomy 3 In religion and literature 4 As lucky or unlucky number 5 Age 18

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It is customary in many cultures to celebrate the anniversary of one's birthday, for example by having a birthday party with family and/or friends. Gifts are often given to the person celebrating the birthday. It is also customary to treat people specially on their birthday, either generally acceding to their wishes, or subjecting them to a rite of transition.

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