204311385 has 24 divisors (see below), whose sum is σ = 357654024. Its totient is φ = 107884800.

The previous prime is 204311383. The next prime is 204311407. The reversal of 204311385 is 583113402.

It is a happy number.

204311385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 143424576 + 60886809 = 11976^2 + 7803^2 .

It is not a de Polignac number, because 204311385 - 2¹ = 204311383 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (204311383) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17932 + ... + 27021.

It is an arithmetic number, because the mean of its divisors is an integer number (14902251).

Almost surely, 2^204311385 is an apocalyptic number.

It is an amenable number.

204311385 is a deficient number, since it is larger than the sum of its proper divisors (153342639).

204311385 is a wasteful number, since it uses less digits than its factorization.

204311385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45065 (or 45062 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 204311385 is about 14293.7533559244. The cubic root of 204311385 is about 588.9758974651.

Adding to 204311385 its reverse (583113402), we get a palindrome (787424787).

The spelling of 204311385 in words is "two hundred four million, three hundred eleven thousand, three hundred eighty-five".