18136920 has 32 divisors (see below), whose sum is σ = 54411120. Its totient is φ = 4836480.

The previous prime is 18136907. The next prime is 18136931. The reversal of 18136920 is 2963181.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 75451 + ... + 75690.

Almost surely, 2^18136920 is an apocalyptic number.

18136920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18136920 is an abundant number, since it is smaller than the sum of its proper divisors (36274200).

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

18136920 is a wasteful number, since it uses less digits than its factorization.

18136920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151155 (or 151151 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 18136920 is about 4258.7462943923. The cubic root of 18136920 is about 262.7369651597.

The spelling of 18136920 in words is "eighteen million, one hundred thirty-six thousand, nine hundred twenty".