204540406 has 12 divisors (see below), whose sum is σ = 356902308. Its totient is φ = 87660132.

The previous prime is 204540397. The next prime is 204540419. The reversal of 204540406 is 604045402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1043476 + ... + 1043671.

It is an arithmetic number, because the mean of its divisors is an integer number (29741859).

Almost surely, 2^204540406 is an apocalyptic number.

204540406 is a deficient number, since it is larger than the sum of its proper divisors (152361902).

204540406 is a wasteful number, since it uses less digits than its factorization.

204540406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2087163 (or 2087156 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 204540406 is about 14301.7623389567. The cubic root of 204540406 is about 589.1958843574.

Adding to 204540406 its reverse (604045402), we get a palindrome (808585808).

The spelling of 204540406 in words is "two hundred four million, five hundred forty thousand, four hundred six".