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18 (eighteen) is the natural number following 17 and preceding 19. Join the web’s most supportive community of creators and get high-quality tools for hosting, sharing, and streaming … 18 is a semiperfect … It is an even composite number. Prime decomposition, primality test, divisors, arithmetic properties, and conversion in binary, … Discover its meanings, facts, significance in math, science, religion, … · some facts about the number 18 are that it is the only positive number that is equal to the sum of the … Explore the fascinating world of the number 18! Properties of 18: