205540365 has 32 divisors (see below), whose sum is σ = 343532160. Its totient is φ = 104834304.

The previous prime is 205540331. The next prime is 205540367. The reversal of 205540365 is 563045502.

It is not a de Polignac number, because 205540365 - 2¹¹ = 205538317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205540367) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29607 + ... + 35883.

It is an arithmetic number, because the mean of its divisors is an integer number (10735380).

Almost surely, 2^205540365 is an apocalyptic number.

It is an amenable number.

205540365 is a deficient number, since it is larger than the sum of its proper divisors (137991795).

205540365 is a wasteful number, since it uses less digits than its factorization.

205540365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6381.

The product of its (nonzero) digits is 18000, while the sum is 30.

The square root of 205540365 is about 14336.6790087523. The cubic root of 205540365 is about 590.1544793233.

Adding to 205540365 its reverse (563045502), we get a palindrome (768585867).

The spelling of 205540365 in words is "two hundred five million, five hundred forty thousand, three hundred sixty-five".