204866 has 4 divisors (see below), whose sum is σ = 307302. Its totient is φ = 102432.

The previous prime is 204859. The next prime is 204871. The reversal of 204866 is 668402.

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., 156025 + 48841 = 395^2 + 221^2 .

It is a Curzon number.

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, 51215 + ... + 51218.

2²⁰⁴⁸⁶⁶ is an apocalyptic number.

204866 is a deficient number, since it is larger than the sum of its proper divisors (102436).

204866 is a wasteful number, since it uses less digits than its factorization.

204866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102435.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 204866 is about 452.6212544722. The cubic root of 204866 is about 58.9508352273.

The spelling of 204866 in words is "two hundred four thousand, eight hundred sixty-six".