18056020 has 24 divisors (see below), whose sum is σ = 37997568. Its totient is φ = 7207200.

The previous prime is 18056011. The next prime is 18056021. The reversal of 18056020 is 2065081.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18055982 and 18056000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18056021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17725 + ... + 18715.

It is an arithmetic number, because the mean of its divisors is an integer number (1583232).

Almost surely, 2^18056020 is an apocalyptic number.

18056020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18056020 is an abundant number, since it is smaller than the sum of its proper divisors (19941548).

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

18056020 is a wasteful number, since it uses less digits than its factorization.

18056020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911 (or 1909 counting only the distinct ones).

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

The square root of 18056020 is about 4249.2375786722. The cubic root of 18056020 is about 262.3457355132.

The spelling of 18056020 in words is "eighteen million, fifty-six thousand, twenty".