204640404 has 24 divisors (see below), whose sum is σ = 479498880. Its totient is φ = 67927104.

The previous prime is 204640391. The next prime is 204640417. The reversal of 204640404 is 404046402.

204640404 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (204640391) and next prime (204640417).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32809 + ... + 38544.

It is an arithmetic number, because the mean of its divisors is an integer number (19979120).

Almost surely, 2^204640404 is an apocalyptic number.

It is an amenable number.

204640404 is an abundant number, since it is smaller than the sum of its proper divisors (274858476).

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

204640404 is a wasteful number, since it uses less digits than its factorization.

204640404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71599 (or 71597 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 204640404 is about 14305.2579144872. The cubic root of 204640404 is about 589.2918862709.

Adding to 204640404 its reverse (404046402), we get a palindrome (608686806).

The spelling of 204640404 in words is "two hundred four million, six hundred forty thousand, four hundred four".