205855872 has 64 divisors (see below), whose sum is σ = 564476160. Its totient is φ = 66401280.

The previous prime is 205855831. The next prime is 205855913. The reversal of 205855872 is 278558502.

It is an interprime number because it is at equal distance from previous prime (205855831) and next prime (205855913).

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3258 + ... + 20550.

It is an arithmetic number, because the mean of its divisors is an integer number (8819940).

Almost surely, 2^205855872 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 205855872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (282238080).

205855872 is an abundant number, since it is smaller than the sum of its proper divisors (358620288).

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

205855872 is a wasteful number, since it uses less digits than its factorization.

205855872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17341 (or 17329 counting only the distinct ones).

The product of its (nonzero) digits is 224000, while the sum is 42.

The square root of 205855872 is about 14347.6782790806. The cubic root of 205855872 is about 590.4562897543.

The spelling of 205855872 in words is "two hundred five million, eight hundred fifty-five thousand, eight hundred seventy-two".