18020920 has 32 divisors (see below), whose sum is σ = 41857920. Its totient is φ = 6975360.

The previous prime is 18020917. The next prime is 18020929. The reversal of 18020920 is 2902081.

It is a junction number, because it is equal to n+sod(n) for n = 18020891 and 18020900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18020929) 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, 6027 + ... + 8506.

It is an arithmetic number, because the mean of its divisors is an integer number (1308060).

Almost surely, 2^18020920 is an apocalyptic number.

18020920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18020920 is an abundant number, since it is smaller than the sum of its proper divisors (23837000).

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

18020920 is a wasteful number, since it uses less digits than its factorization.

18020920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14575 (or 14571 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 18020920 is about 4245.1054168301. The cubic root of 18020920 is about 262.1756295759.

The spelling of 18020920 in words is "eighteen million, twenty thousand, nine hundred twenty".