205231656 has 128 divisors (see below), whose sum is σ = 611573760. Its totient is φ = 56160000.

The previous prime is 205231643. The next prime is 205231661. The reversal of 205231656 is 656132502.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 817531 + ... + 817781.

It is an arithmetic number, because the mean of its divisors is an integer number (4777920).

Almost surely, 2^205231656 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 205231656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305786880).

205231656 is an abundant number, since it is smaller than the sum of its proper divisors (406342104).

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

205231656 is a wasteful number, since it uses less digits than its factorization.

205231656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455 (or 451 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 205231656 is about 14325.9085575750. The cubic root of 205231656 is about 589.8588726897.

The spelling of 205231656 in words is "two hundred five million, two hundred thirty-one thousand, six hundred fifty-six".