18235920 has 40 divisors (see below), whose sum is σ = 56532096. Its totient is φ = 4862848.

The previous prime is 18235907. The next prime is 18235927. The reversal of 18235920 is 2953281.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

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

It is not an unprimeable number, because it can be changed into a prime (18235927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37752 + ... + 38231.

Almost surely, 2^18235920 is an apocalyptic number.

18235920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18235920 is an abundant number, since it is smaller than the sum of its proper divisors (38296176).

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

18235920 is a wasteful number, since it uses less digits than its factorization.

18235920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75999 (or 75993 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 18235920 is about 4270.3536153344. The cubic root of 18235920 is about 263.2141460664.

The spelling of 18235920 in words is "eighteen million, two hundred thirty-five thousand, nine hundred twenty".