18330520 has 32 divisors (see below), whose sum is σ = 44417520. Its totient is φ = 6768000.

The previous prime is 18330509. The next prime is 18330541. The reversal of 18330520 is 2503381.

It is a junction number, because it is equal to n+sod(n) for n = 18330491 and 18330500.

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, 17106 + ... + 18145.

Almost surely, 2^18330520 is an apocalyptic number.

18330520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18330520 is an abundant number, since it is smaller than the sum of its proper divisors (26087000).

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

18330520 is a wasteful number, since it uses less digits than its factorization.

18330520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35275 (or 35271 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 18330520 is about 4281.4156537295. The cubic root of 18330520 is about 263.6685080252.

It can be divided in two parts, 183 and 30520, that added together give a palindrome (30703).

The spelling of 18330520 in words is "eighteen million, three hundred thirty thousand, five hundred twenty".