204636 has 12 divisors (see below), whose sum is σ = 477512. Its totient is φ = 68208.

The previous prime is 204623. The next prime is 204641. The reversal of 204636 is 636402.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8515 + ... + 8538.

2²⁰⁴⁶³⁶ is an apocalyptic number.

It is an amenable number.

204636 is an abundant number, since it is smaller than the sum of its proper divisors (272876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204636 is a wasteful number, since it uses less digits than its factorization.

204636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17060 (or 17058 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 204636 is about 452.3671075576. The cubic root of 204636 is about 58.9287658921.

It can be divided in two parts, 20 and 4636, that added together give a triangular number (4656 = T₉₆).

The spelling of 204636 in words is "two hundred four thousand, six hundred thirty-six".