18230920 has 32 divisors (see below), whose sum is σ = 41212800. Its totient is φ = 7258048.

The previous prime is 18230917. The next prime is 18230923. The reversal of 18230920 is 2903281.

It is an interprime number because it is at equal distance from previous prime (18230917) and next prime (18230923).

It is not an unprimeable number, because it can be changed into a prime (18230923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8607 + ... + 10513.

It is an arithmetic number, because the mean of its divisors is an integer number (1287900).

Almost surely, 2^18230920 is an apocalyptic number.

18230920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18230920 is an abundant number, since it is smaller than the sum of its proper divisors (22981880).

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

18230920 is a wasteful number, since it uses less digits than its factorization.

18230920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157 (or 2153 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 18230920 is about 4269.7681435881. The cubic root of 18230920 is about 263.1900874862.

It can be divided in two parts, 182309 and 20, that added together give a square (182329 = 427²).

The spelling of 18230920 in words is "eighteen million, two hundred thirty thousand, nine hundred twenty".