18845220 has 48 divisors (see below), whose sum is σ = 52960320. Its totient is φ = 5006976.

The previous prime is 18845201. The next prime is 18845221. The reversal of 18845220 is 2254881.

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

It is not an unprimeable number, because it can be changed into a prime (18845221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26226 + ... + 26934.

It is an arithmetic number, because the mean of its divisors is an integer number (1103340).

Almost surely, 2^18845220 is an apocalyptic number.

18845220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18845220 is an abundant number, since it is smaller than the sum of its proper divisors (34115100).

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

18845220 is a wasteful number, since it uses less digits than its factorization.

18845220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164 (or 1162 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 18845220 is about 4341.1081534558. The cubic root of 18845220 is about 266.1136002616.

The spelling of 18845220 in words is "eighteen million, eight hundred forty-five thousand, two hundred twenty".