205043490 has 24 divisors (see below), whose sum is σ = 533113308. Its totient is φ = 54678240.

The previous prime is 205043471. The next prime is 205043491. The reversal of 205043490 is 94340502.

It can be written as a sum of positive squares in 2 ways, for example, as 198556281 + 6487209 = 14091^2 + 2547^2 .

It is not an unprimeable number, because it can be changed into a prime (205043491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1139041 + ... + 1139220.

Almost surely, 2^205043490 is an apocalyptic number.

205043490 is an abundant number, since it is smaller than the sum of its proper divisors (328069818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205043490 is a wasteful number, since it uses less digits than its factorization.

205043490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2278274 (or 2278271 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 205043490 is about 14319.3397194144. The cubic root of 205043490 is about 589.6785474826.

Adding to 205043490 its reverse (94340502), we get a palindrome (299383992).

The spelling of 205043490 in words is "two hundred five million, forty-three thousand, four hundred ninety".