18516020 has 24 divisors (see below), whose sum is σ = 39379200. Its totient is φ = 7312032.

The previous prime is 18515993. The next prime is 18516023. The reversal of 18516020 is 2061581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18516023) 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, 4280 + ... + 7439.

It is an arithmetic number, because the mean of its divisors is an integer number (1640800).

Almost surely, 2^18516020 is an apocalyptic number.

18516020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18516020 is an abundant number, since it is smaller than the sum of its proper divisors (20863180).

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

18516020 is a wasteful number, since it uses less digits than its factorization.

18516020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11807 (or 11805 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 18516020 is about 4303.0245177084. The cubic root of 18516020 is about 264.5549430068.

The spelling of 18516020 in words is "eighteen million, five hundred sixteen thousand, twenty".