204811 has 4 divisors (see below), whose sum is σ = 206800. Its totient is φ = 202824.

The previous prime is 204803. The next prime is 204821. The reversal of 204811 is 118402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 204811 - 2³ = 204803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 831 + ... + 1048.

It is an arithmetic number, because the mean of its divisors is an integer number (51700).

2²⁰⁴⁸¹¹ is an apocalyptic number.

204811 is a deficient number, since it is larger than the sum of its proper divisors (1989).

204811 is a wasteful number, since it uses less digits than its factorization.

204811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 204811 is about 452.5604931940. The cubic root of 204811 is about 58.9455592809.

The spelling of 204811 in words is "two hundred four thousand, eight hundred eleven".