18978620 has 24 divisors (see below), whose sum is σ = 39984000. Its totient is φ = 7566912.

The previous prime is 18978601. The next prime is 18978637. The reversal of 18978620 is 2687981.

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, 5621 + ... + 8339.

It is an arithmetic number, because the mean of its divisors is an integer number (1666000).

Almost surely, 2^18978620 is an apocalyptic number.

18978620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18978620 is an abundant number, since it is smaller than the sum of its proper divisors (21005380).

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

18978620 is a wasteful number, since it uses less digits than its factorization.

18978620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3077 (or 3075 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 18978620 is about 4356.4457990431. The cubic root of 18978620 is about 266.7400388379.

The spelling of 18978620 in words is "eighteen million, nine hundred seventy-eight thousand, six hundred twenty".