18233820 has 72 divisors (see below), whose sum is σ = 60343920. Its totient is φ = 4419840.

The previous prime is 18233801. The next prime is 18233821. The reversal of 18233820 is 2833281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18233821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2625 + ... + 6584.

It is an arithmetic number, because the mean of its divisors is an integer number (838110).

Almost surely, 2^18233820 is an apocalyptic number.

18233820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18233820 is an abundant number, since it is smaller than the sum of its proper divisors (42110100).

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

18233820 is a wasteful number, since it uses less digits than its factorization.

18233820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9235 (or 9230 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 18233820 is about 4270.1077269783. The cubic root of 18233820 is about 263.2040419984.

The spelling of 18233820 in words is "eighteen million, two hundred thirty-three thousand, eight hundred twenty".