204323405 has 16 divisors (see below), whose sum is σ = 288054144. Its totient is φ = 137167680.

The previous prime is 204323393. The next prime is 204323461. The reversal of 204323405 is 504323402.

It is not a de Polignac number, because 204323405 - 2⁸ = 204323149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142169 + ... + 143598.

It is an arithmetic number, because the mean of its divisors is an integer number (18003384).

Almost surely, 2^204323405 is an apocalyptic number.

It is an amenable number.

204323405 is a deficient number, since it is larger than the sum of its proper divisors (83730739).

204323405 is a wasteful number, since it uses less digits than its factorization.

204323405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285796.

The product of its (nonzero) digits is 2880, while the sum is 23.

The square root of 204323405 is about 14294.1738131310. The cubic root of 204323405 is about 588.9874474031.

Adding to 204323405 its reverse (504323402), we get a palindrome (708646807).

The spelling of 204323405 in words is "two hundred four million, three hundred twenty-three thousand, four hundred five".