18020056 has 32 divisors (see below), whose sum is σ = 35942400. Its totient is φ = 8445600.

The previous prime is 18020039. The next prime is 18020059. The reversal of 18020056 is 65002081.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18020059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15081 + ... + 16231.

It is an arithmetic number, because the mean of its divisors is an integer number (1123200).

Almost surely, 2^18020056 is an apocalyptic number.

It is an amenable number.

18020056 is a deficient number, since it is larger than the sum of its proper divisors (17922344).

18020056 is a wasteful number, since it uses less digits than its factorization.

18020056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279 (or 1275 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 18020056 is about 4245.0036513530. The cubic root of 18020056 is about 262.1714395685.

The spelling of 18020056 in words is "eighteen million, twenty thousand, fifty-six".