205541290 has 32 divisors (see below), whose sum is σ = 388840320. Its totient is φ = 78128064.

The previous prime is 205541251. The next prime is 205541353. The reversal of 205541290 is 92145502.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9451 + ... + 22369.

It is an arithmetic number, because the mean of its divisors is an integer number (12151260).

Almost surely, 2^205541290 is an apocalyptic number.

205541290 is a deficient number, since it is larger than the sum of its proper divisors (183299030).

205541290 is a wasteful number, since it uses less digits than its factorization.

205541290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13006.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 205541290 is about 14336.7112686278. The cubic root of 205541290 is about 590.1553646191.

Adding to 205541290 its reverse (92145502), we get a palindrome (297686792).

It can be divided in two parts, 2055412 and 90, that added together give a palindrome (2055502).

The spelling of 205541290 in words is "two hundred five million, five hundred forty-one thousand, two hundred ninety".