18805320 has 48 divisors (see below), whose sum is σ = 61118460. Its totient is φ = 5014656.

The previous prime is 18805279. The next prime is 18805321. The reversal of 18805320 is 2350881.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18507204 + 298116 = 4302^2 + 546^2 .

It is not an unprimeable number, because it can be changed into a prime (18805321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25759 + ... + 26478.

Almost surely, 2^18805320 is an apocalyptic number.

18805320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18805320 is an abundant number, since it is smaller than the sum of its proper divisors (42313140).

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

18805320 is a wasteful number, since it uses less digits than its factorization.

18805320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52254 (or 52247 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 18805320 is about 4336.5101175946. The cubic root of 18805320 is about 265.9256580836.

The spelling of 18805320 in words is "eighteen million, eight hundred five thousand, three hundred twenty".