205987885 has 16 divisors (see below), whose sum is σ = 259257600. Its totient is φ = 156816000.

The previous prime is 205987883. The next prime is 205987889. The reversal of 205987885 is 588789502.

It is a happy number.

It is not a de Polignac number, because 205987885 - 2¹ = 205987883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205987883) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 18385 + ... + 27385.

It is an arithmetic number, because the mean of its divisors is an integer number (16203600).

Almost surely, 2^205987885 is an apocalyptic number.

It is an amenable number.

205987885 is a deficient number, since it is larger than the sum of its proper divisors (53269715).

205987885 is a wasteful number, since it uses less digits than its factorization.

205987885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9228.

The product of its (nonzero) digits is 1612800, while the sum is 52.

The square root of 205987885 is about 14352.2780421785. The cubic root of 205987885 is about 590.5824803895.

The spelling of 205987885 in words is "two hundred five million, nine hundred eighty-seven thousand, eight hundred eighty-five".