18122320 has 40 divisors (see below), whose sum is σ = 42318720. Its totient is φ = 7217280.

The previous prime is 18122317. The next prime is 18122327. The reversal of 18122320 is 2322181.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18122327) 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, 28405 + ... + 29035.

It is an arithmetic number, because the mean of its divisors is an integer number (1057968).

Almost surely, 2^18122320 is an apocalyptic number.

18122320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18122320 is an abundant number, since it is smaller than the sum of its proper divisors (24196400).

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

18122320 is a wasteful number, since it uses less digits than its factorization.

18122320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003 (or 997 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 18122320 is about 4257.0318298082. The cubic root of 18122320 is about 262.6664462136. Note that the first 3 decimals are identical.

The spelling of 18122320 in words is "eighteen million, one hundred twenty-two thousand, three hundred twenty".