18204 has 24 divisors (see below), whose sum is σ = 44688. Its totient is φ = 5760.

The previous prime is 18199. The next prime is 18211. The reversal of 18204 is 40281.

18204 = T₁₁ + T₁₂ + ... + T₄₇.

18204 is nontrivially palindromic in base 8.

18204 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

18204 is an undulating number in base 8.

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

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, 424 + ... + 464.

It is an arithmetic number, because the mean of its divisors is an integer number (1862).

2¹⁸²⁰⁴ is an apocalyptic number.

It is an amenable number.

18204 is an abundant number, since it is smaller than the sum of its proper divisors (26484).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22344).

18204 is a wasteful number, since it uses less digits than its factorization.

18204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 18204 is about 134.9221998042. The cubic root of 18204 is about 26.3060480435.

Adding to 18204 its reverse (40281), we get a palindrome (58485).

It can be divided in two parts, 18 and 204, that added together give a palindrome (222).

The spelling of 18204 in words is "eighteen thousand, two hundred four".