204818 has 4 divisors (see below), whose sum is σ = 307230. Its totient is φ = 102408.

The previous prime is 204803. The next prime is 204821. The reversal of 204818 is 818402.

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

It can be written as a sum of positive squares in only one way, i.e., 104329 + 100489 = 323^2 + 317^2 .

It is a junction number, because it is equal to n+sod(n) for n = 204793 and 204802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51203 + ... + 51206.

2²⁰⁴⁸¹⁸ is an apocalyptic number.

204818 is a deficient number, since it is larger than the sum of its proper divisors (102412).

204818 is a wasteful number, since it uses less digits than its factorization.

204818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102411.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 204818 is about 452.5682269007. The cubic root of 204818 is about 58.9462308174.

It can be divided in two parts, 2048 and 18, that multiplied together give a square (36864 = 192²).

The spelling of 204818 in words is "two hundred four thousand, eight hundred eighteen".