20204 has 6 divisors (see below), whose sum is σ = 35364. Its totient is φ = 10100.

The previous prime is 20201. The next prime is 20219. The reversal of 20204 is 40202.

It is a junction number, because it is equal to n+sod(n) for n = 20191 and 20200.

It is not an unprimeable number, because it can be changed into a prime (20201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2522 + ... + 2529.

It is an arithmetic number, because the mean of its divisors is an integer number (5894).

2²⁰²⁰⁴ is an apocalyptic number.

It is an amenable number.

20204 is a deficient number, since it is larger than the sum of its proper divisors (15160).

20204 is a wasteful number, since it uses less digits than its factorization.

20204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5055 (or 5053 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 8.

The square root of 20204 is about 142.1407752899. The cubic root of 20204 is about 27.2361543444.

Adding to 20204 its reverse (40202), we get a palindrome (60406).

The spelling of 20204 in words is "twenty thousand, two hundred four", and thus it is an iban number.