18811056 has 80 divisors (see below), whose sum is σ = 55353600. Its totient is φ = 5448960.

The previous prime is 18811049. The next prime is 18811057. The reversal of 18811056 is 65011881.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18811057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11370 + ... + 12918.

It is an arithmetic number, because the mean of its divisors is an integer number (691920).

Almost surely, 2^18811056 is an apocalyptic number.

18811056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18811056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27676800).

18811056 is an abundant number, since it is smaller than the sum of its proper divisors (36542544).

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

18811056 is a wasteful number, since it uses less digits than its factorization.

18811056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594 (or 1588 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 18811056 is about 4337.1714284773. The cubic root of 18811056 is about 265.9526928892.

The spelling of 18811056 in words is "eighteen million, eight hundred eleven thousand, fifty-six".