204120404 has 6 divisors (see below), whose sum is σ = 357210714. Its totient is φ = 102060200.

The previous prime is 204120403. The next prime is 204120407. The reversal of 204120404 is 404021402.

It can be written as a sum of positive squares in only one way, i.e., 153710404 + 50410000 = 12398^2 + 7100^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204120403) 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, 25515047 + ... + 25515054.

It is an arithmetic number, because the mean of its divisors is an integer number (59535119).

Almost surely, 2^204120404 is an apocalyptic number.

It is an amenable number.

204120404 is a deficient number, since it is larger than the sum of its proper divisors (153090310).

204120404 is a wasteful number, since it uses less digits than its factorization.

204120404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51030105 (or 51030103 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 204120404 is about 14287.0712184128. The cubic root of 204120404 is about 588.7923242848.

Adding to 204120404 its reverse (404021402), we get a palindrome (608141806).

The spelling of 204120404 in words is "two hundred four million, one hundred twenty thousand, four hundred four".