204813 has 12 divisors (see below), whose sum is σ = 338208. Its totient is φ = 117000.

The previous prime is 204803. The next prime is 204821. The reversal of 204813 is 318402.

It is a happy number.

It is not a de Polignac number, because 204813 - 2⁴ = 204797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1563 + ... + 1688.

It is an arithmetic number, because the mean of its divisors is an integer number (28184).

2²⁰⁴⁸¹³ is an apocalyptic number.

It is an amenable number.

204813 is a deficient number, since it is larger than the sum of its proper divisors (133395).

204813 is a wasteful number, since it uses less digits than its factorization.

204813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3264 (or 3261 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 204813 is about 452.5627028380. The cubic root of 204813 is about 58.9457511500.

The spelling of 204813 in words is "two hundred four thousand, eight hundred thirteen".