205887881 has 8 divisors (see below), whose sum is σ = 218894400. Its totient is φ = 193219312.

The previous prime is 205887863. The next prime is 205887889. The reversal of 205887881 is 188788502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205887881 - 2¹⁸ = 205625737 is a prime.

It is a super-2 number, since 2×205887881² = 84779639085340322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205887889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83231 + ... + 85668.

It is an arithmetic number, because the mean of its divisors is an integer number (27361800).

Almost surely, 2^205887881 is an apocalyptic number.

It is an amenable number.

205887881 is a deficient number, since it is larger than the sum of its proper divisors (13006519).

205887881 is a wasteful number, since it uses less digits than its factorization.

205887881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168975.

The product of its (nonzero) digits is 286720, while the sum is 47.

The square root of 205887881 is about 14348.7937123648. The cubic root of 205887881 is about 590.4868919675.

The spelling of 205887881 in words is "two hundred five million, eight hundred eighty-seven thousand, eight hundred eighty-one".