18057550 has 24 divisors (see below), whose sum is σ = 38385936. Its totient is φ = 6191040.

The previous prime is 18057547. The next prime is 18057551. The reversal of 18057550 is 5575081.

It is a super-2 number, since 2×18057550² = 652150224005000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18057551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25447 + ... + 26146.

It is an arithmetic number, because the mean of its divisors is an integer number (1599414).

Almost surely, 2^18057550 is an apocalyptic number.

18057550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18057550 is an abundant number, since it is smaller than the sum of its proper divisors (20328386).

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

18057550 is a wasteful number, since it uses less digits than its factorization.

18057550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51612 (or 51607 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 31.

The square root of 18057550 is about 4249.4176071551. The cubic root of 18057550 is about 262.3531453713.

It can be divided in two parts, 180575 and 50, that added together give a square (180625 = 425²).

The spelling of 18057550 in words is "eighteen million, fifty-seven thousand, five hundred fifty".