205855884 has 96 divisors (see below), whose sum is σ = 579156480. Its totient is φ = 62856000.

The previous prime is 205855831. The next prime is 205855913. The reversal of 205855884 is 488558502.

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 31 ways as a sum of consecutive naturals, for example, 211519 + ... + 212489.

It is an arithmetic number, because the mean of its divisors is an integer number (6032880).

Almost surely, 2^205855884 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 205855884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289578240).

205855884 is an abundant number, since it is smaller than the sum of its proper divisors (373300596).

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

205855884 is a wasteful number, since it uses less digits than its factorization.

205855884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 512000, while the sum is 45.

The square root of 205855884 is about 14347.6786972667. The cubic root of 205855884 is about 590.4563012275.

The spelling of 205855884 in words is "two hundred five million, eight hundred fifty-five thousand, eight hundred eighty-four".