18920940 has 24 divisors (see below), whose sum is σ = 52978800. Its totient is φ = 5045568.

The previous prime is 18920939. The next prime is 18920959. The reversal of 18920940 is 4902981.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157615 + ... + 157734.

It is an arithmetic number, because the mean of its divisors is an integer number (2207450).

Almost surely, 2^18920940 is an apocalyptic number.

18920940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18920940 is an abundant number, since it is smaller than the sum of its proper divisors (34057860).

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

18920940 is a wasteful number, since it uses less digits than its factorization.

18920940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315361 (or 315359 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 18920940 is about 4349.8206859594. The cubic root of 18920940 is about 266.4695383403.

The spelling of 18920940 in words is "eighteen million, nine hundred twenty thousand, nine hundred forty".