18000520 has 32 divisors (see below), whose sum is σ = 40622400. Its totient is φ = 7178688.

The previous prime is 18000473. The next prime is 18000527. The reversal of 18000520 is 2500081.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18000494 and 18000503.

It is not an unprimeable number, because it can be changed into a prime (18000527) 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, 24397 + ... + 25123.

It is an arithmetic number, because the mean of its divisors is an integer number (1269450).

Almost surely, 2^18000520 is an apocalyptic number.

18000520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18000520 is an abundant number, since it is smaller than the sum of its proper divisors (22621880).

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

18000520 is a wasteful number, since it uses less digits than its factorization.

18000520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357 (or 1353 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 18000520 is about 4242.7019692644. The cubic root of 18000520 is about 262.0766630735.

The spelling of 18000520 in words is "eighteen million, five hundred twenty", and thus it is an aban number.