205540210 has 32 divisors (see below), whose sum is σ = 375289200. Its totient is φ = 81043200.

The previous prime is 205540207. The next prime is 205540267. The reversal of 205540210 is 12045502.

It can be written as a sum of positive squares in 8 ways, for example, as 96609241 + 108930969 = 9829^2 + 10437^2 .

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, 292860 + ... + 293560.

Almost surely, 2^205540210 is an apocalyptic number.

205540210 is a deficient number, since it is larger than the sum of its proper divisors (169748990).

205540210 is a wasteful number, since it uses less digits than its factorization.

205540210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 205540210 is about 14336.6736030364. The cubic root of 205540210 is about 590.1543309761.

Adding to 205540210 its reverse (12045502), we get a palindrome (217585712).

The spelling of 205540210 in words is "two hundred five million, five hundred forty thousand, two hundred ten".