18305320 has 32 divisors (see below), whose sum is σ = 44932320. Its totient is φ = 6656320.

The previous prime is 18305297. The next prime is 18305323. The reversal of 18305320 is 2350381.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 18305291 and 18305300.

It is not an unprimeable number, because it can be changed into a prime (18305323) 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, 20362 + ... + 21241.

It is an arithmetic number, because the mean of its divisors is an integer number (1404135).

Almost surely, 2^18305320 is an apocalyptic number.

18305320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18305320 is an abundant number, since it is smaller than the sum of its proper divisors (26627000).

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

18305320 is a wasteful number, since it uses less digits than its factorization.

18305320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41625 (or 41621 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 18305320 is about 4278.4716897509. The cubic root of 18305320 is about 263.5476259560.

The spelling of 18305320 in words is "eighteen million, three hundred five thousand, three hundred twenty".