205540445 has 16 divisors (see below), whose sum is σ = 270864000. Its totient is φ = 148488000.

The previous prime is 205540403. The next prime is 205540457. The reversal of 205540445 is 544045502.

It is not a de Polignac number, because 205540445 - 2⁸ = 205540189 is a prime.

It is a congruent number.

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, 4070 + ... + 20679.

It is an arithmetic number, because the mean of its divisors is an integer number (16929000).

Almost surely, 2^205540445 is an apocalyptic number.

It is an amenable number.

205540445 is a deficient number, since it is larger than the sum of its proper divisors (65323555).

205540445 is a wasteful number, since it uses less digits than its factorization.

205540445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24916.

The product of its (nonzero) digits is 16000, while the sum is 29.

The square root of 205540445 is about 14336.6817987985. The cubic root of 205540445 is about 590.1545558895.

Adding to 205540445 its reverse (544045502), we get a palindrome (749585947).

The spelling of 205540445 in words is "two hundred five million, five hundred forty thousand, four hundred forty-five".