240

240 is a pronic number, since it can be expressed as the product of two consecutive integers, 15 and 16. It is a semiperfect number,equal to the concatenation of two of its proper divisors (24 and 40). It is also the 12th highly composite number, with 20 divisors in total, more than any smaller number;and a refactorable number or tau number, since one of its divisors is 20, which divides 240 evenly.