18085550 has 24 divisors (see below), whose sum is σ = 38445456. Its totient is φ = 6200640.

The previous prime is 18085519. The next prime is 18085559. The reversal of 18085550 is 5558081.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18085559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25487 + ... + 26186.

It is an arithmetic number, because the mean of its divisors is an integer number (1601894).

Almost surely, 2^18085550 is an apocalyptic number.

18085550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18085550 is an abundant number, since it is smaller than the sum of its proper divisors (20359906).

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

18085550 is a wasteful number, since it uses less digits than its factorization.

18085550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51692 (or 51687 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 32.

The square root of 18085550 is about 4252.7109001201. The cubic root of 18085550 is about 262.4886767602.

The spelling of 18085550 in words is "eighteen million, eighty-five thousand, five hundred fifty".