205510256 has 80 divisors (see below), whose sum is σ = 470059200. Its totient is φ = 85223424.

The previous prime is 205510243. The next prime is 205510271. The reversal of 205510256 is 652015502.

It is a congruent number.

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, 528110 + ... + 528498.

It is an arithmetic number, because the mean of its divisors is an integer number (5875740).

Almost surely, 2^205510256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205510256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235029600).

205510256 is an abundant number, since it is smaller than the sum of its proper divisors (264548944).

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

205510256 is a wasteful number, since it uses less digits than its factorization.

205510256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 205510256 is about 14335.6289014469. The cubic root of 205510256 is about 590.1256612548.

Adding to 205510256 its reverse (652015502), we get a palindrome (857525758).

The spelling of 205510256 in words is "two hundred five million, five hundred ten thousand, two hundred fifty-six".