18315020 has 24 divisors (see below), whose sum is σ = 38572800. Its totient is φ = 7304832.

The previous prime is 18315019. The next prime is 18315023. The reversal of 18315020 is 2051381.

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 = 18314983 and 18315001.

It is not an unprimeable number, because it can be changed into a prime (18315023) 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 7 ways as a sum of consecutive naturals, for example, 7061 + ... + 9299.

It is an arithmetic number, because the mean of its divisors is an integer number (1607200).

Almost surely, 2^18315020 is an apocalyptic number.

18315020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18315020 is an abundant number, since it is smaller than the sum of its proper divisors (20257780).

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

18315020 is a wasteful number, since it uses less digits than its factorization.

18315020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2657 (or 2655 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 18315020 is about 4279.6051219710. The cubic root of 18315020 is about 263.5941690840.

The spelling of 18315020 in words is "eighteen million, three hundred fifteen thousand, twenty".