18006320 has 20 divisors (see below), whose sum is σ = 41864880. Its totient is φ = 7202496.

The previous prime is 18006299. The next prime is 18006323. The reversal of 18006320 is 2360081.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 18006292 and 18006301.

It is not an unprimeable number, because it can be changed into a prime (18006323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112460 + ... + 112619.

It is an arithmetic number, because the mean of its divisors is an integer number (2093244).

Almost surely, 2^18006320 is an apocalyptic number.

18006320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18006320 is an abundant number, since it is smaller than the sum of its proper divisors (23858560).

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

18006320 is a wasteful number, since it uses less digits than its factorization.

18006320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225092 (or 225086 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 18006320 is about 4243.3854408950. The cubic root of 18006320 is about 262.1048082125.

The spelling of 18006320 in words is "eighteen million, six thousand, three hundred twenty".