18620385 has 16 divisors (see below), whose sum is σ = 34048896. Its totient is φ = 8512128.

The previous prime is 18620353. The next prime is 18620387. The reversal of 18620385 is 58302681.

It is a happy number.

It is not a de Polignac number, because 18620385 - 2⁵ = 18620353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18620387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88564 + ... + 88773.

It is an arithmetic number, because the mean of its divisors is an integer number (2128056).

Almost surely, 2^18620385 is an apocalyptic number.

18620385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18620385 is a deficient number, since it is larger than the sum of its proper divisors (15428511).

18620385 is a wasteful number, since it uses less digits than its factorization.

18620385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177352.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 18620385 is about 4315.1344127385. The cubic root of 18620385 is about 265.0510640886.

The spelling of 18620385 in words is "eighteen million, six hundred twenty thousand, three hundred eighty-five".