18920385 has 80 divisors (see below), whose sum is σ = 38472192. Its totient is φ = 8812800.

The previous prime is 18920353. The next prime is 18920399. The reversal of 18920385 is 58302981.

It is not a de Polignac number, because 18920385 - 2⁵ = 18920353 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 138037 + ... + 138173.

Almost surely, 2^18920385 is an apocalyptic number.

18920385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18920385 is an abundant number, since it is smaller than the sum of its proper divisors (19551807).

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

18920385 is a wasteful number, since it uses less digits than its factorization.

18920385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 18920385 is about 4349.7568897583. The cubic root of 18920385 is about 266.4669329017.

The spelling of 18920385 in words is "eighteen million, nine hundred twenty thousand, three hundred eighty-five".