204540505 has 16 divisors (see below), whose sum is σ = 267062544. Its totient is φ = 149483520.

The previous prime is 204540499. The next prime is 204540527. The reversal of 204540505 is 505045402.

It can be written as a sum of positive squares in 8 ways, for example, as 21904 + 204518601 = 148^2 + 14301^2 .

It is not a de Polignac number, because 204540505 - 2⁵ = 204540473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204540505.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 9916 + ... + 22525.

It is an arithmetic number, because the mean of its divisors is an integer number (16691409).

Almost surely, 2^204540505 is an apocalyptic number.

It is an amenable number.

204540505 is a deficient number, since it is larger than the sum of its proper divisors (62522039).

204540505 is a wasteful number, since it uses less digits than its factorization.

204540505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32556.

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 204540505 is about 14301.7658000682. The cubic root of 204540505 is about 589.1959794167.

Adding to 204540505 its reverse (505045402), we get a palindrome (709585907).

The spelling of 204540505 in words is "two hundred four million, five hundred forty thousand, five hundred five".