18033320820 has 24 divisors (see below), whose sum is σ = 50493298464. Its totient is φ = 4808885536.

The previous prime is 18033320803. The next prime is 18033320909. The reversal of 18033320820 is 2802333081.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150277614 + ... + 150277733.

It is an arithmetic number, because the mean of its divisors is an integer number (2103887436).

Almost surely, 2^18033320820 is an apocalyptic number.

18033320820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18033320820 is an abundant number, since it is smaller than the sum of its proper divisors (32459977644).

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

18033320820 is a wasteful number, since it uses less digits than its factorization.

18033320820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300555359 (or 300555357 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The spelling of 18033320820 in words is "eighteen billion, thirty-three million, three hundred twenty thousand, eight hundred twenty".