205145256 has 32 divisors (see below), whose sum is σ = 543032640. Its totient is φ = 64359168.

The previous prime is 205145249. The next prime is 205145323. The reversal of 205145256 is 652541502.

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 7 ways as a sum of consecutive naturals, for example, 250996 + ... + 251811.

It is an arithmetic number, because the mean of its divisors is an integer number (16969770).

Almost surely, 2^205145256 is an apocalyptic number.

It is an amenable number.

205145256 is an abundant number, since it is smaller than the sum of its proper divisors (337887384).

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

205145256 is a wasteful number, since it uses less digits than its factorization.

205145256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502833 (or 502829 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 205145256 is about 14322.8927245860. The cubic root of 205145256 is about 589.7760866306.

Adding to 205145256 its reverse (652541502), we get a palindrome (857686758).

The spelling of 205145256 in words is "two hundred five million, one hundred forty-five thousand, two hundred fifty-six".