11551620 has 48 divisors (see below), whose sum is σ = 34050240. Its totient is φ = 2918016.

The previous prime is 11551609. The next prime is 11551643. The reversal of 11551620 is 2615511.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3927 + ... + 6206.

It is an arithmetic number, because the mean of its divisors is an integer number (709380).

Almost surely, 2^11551620 is an apocalyptic number.

11551620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11551620 is an abundant number, since it is smaller than the sum of its proper divisors (22498620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11551620 is a wasteful number, since it uses less digits than its factorization.

11551620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10164 (or 10162 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 11551620 is about 3398.7674236405. The cubic root of 11551620 is about 226.0550939898.

It can be divided in two parts, 1155 and 1620, that added together give a triangular number (2775 = T₇₄).

The spelling of 11551620 in words is "eleven million, five hundred fifty-one thousand, six hundred twenty".