18945620 has 24 divisors (see below), whose sum is σ = 39871104. Its totient is φ = 7562016.

The previous prime is 18945611. The next prime is 18945637. The reversal of 18945620 is 2654981.

It is a congruent number.

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, 13889 + ... + 15191.

It is an arithmetic number, because the mean of its divisors is an integer number (1661296).

Almost surely, 2^18945620 is an apocalyptic number.

18945620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18945620 is an abundant number, since it is smaller than the sum of its proper divisors (20925484).

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

18945620 is a wasteful number, since it uses less digits than its factorization.

18945620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2039 (or 2037 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 18945620 is about 4352.6566600181. The cubic root of 18945620 is about 266.5853467318.

The spelling of 18945620 in words is "eighteen million, nine hundred forty-five thousand, six hundred twenty".