18885920 has 24 divisors (see below), whose sum is σ = 44618364. Its totient is φ = 7554304.

The previous prime is 18885907. The next prime is 18885961. The reversal of 18885920 is 2958881.

It can be written as a sum of positive squares in 2 ways, for example, as 18627856 + 258064 = 4316^2 + 508^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58859 + ... + 59178.

Almost surely, 2^18885920 is an apocalyptic number.

18885920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18885920 is an abundant number, since it is smaller than the sum of its proper divisors (25732444).

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

18885920 is a wasteful number, since it uses less digits than its factorization.

18885920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118052 (or 118044 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 18885920 is about 4345.7933683046. The cubic root of 18885920 is about 266.3050375910.

The spelling of 18885920 in words is "eighteen million, eight hundred eighty-five thousand, nine hundred twenty".