204664 has 8 divisors (see below), whose sum is σ = 383760. Its totient is φ = 102328.

The previous prime is 204641. The next prime is 204667. The reversal of 204664 is 466402.

It is a tau number, because it is divible by the number of its divisors (8).

It is a d-powerful number, because it can be written as 2¹⁷ + 0 + 6³ + 4³ + 6⁵ + 4⁸ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204667) by changing a digit.

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 as a sum of consecutive naturals, namely, 12784 + ... + 12799.

It is an arithmetic number, because the mean of its divisors is an integer number (47970).

2²⁰⁴⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

204664 is a deficient number, since it is larger than the sum of its proper divisors (179096).

204664 is a wasteful number, since it uses less digits than its factorization.

204664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25589 (or 25585 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 204664 is about 452.3980548146. The cubic root of 204664 is about 58.9314534775.

It can be divided in two parts, 204 and 664, that added together give a palindrome (868).

The spelling of 204664 in words is "two hundred four thousand, six hundred sixty-four".