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It is an even composite number. Prime decomposition, primality test, divisors, arithmetic properties, and conversion in binary, octal, hexadecimal, etc. Explore the fascinating world of the number 18! · some facts about the number 18 are that it is the only positive number that is equal to the sum of the digits multiplied by … 18 is a semiperfect number [1] and an … Properties of 18: Discover its meanings, facts, significance in math, science, religion, angel numbers, and its … Join the web’s most supportive community of creators and get high-quality tools for hosting, sharing, and streaming videos in gorgeous hd … 18 (eighteen) is the natural number following 17 and preceding 19.