205989836 has 12 divisors (see below), whose sum is σ = 388211712. Its totient is φ = 95072208.

The previous prime is 205989829. The next prime is 205989857. The reversal of 205989836 is 638989502.

205989836 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1980620 + ... + 1980723.

It is an arithmetic number, because the mean of its divisors is an integer number (32350976).

Almost surely, 2^205989836 is an apocalyptic number.

205989836 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

205989836 is a deficient number, since it is larger than the sum of its proper divisors (182221876).

205989836 is a wasteful number, since it uses less digits than its factorization.

205989836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3961360 (or 3961358 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 50.

The square root of 205989836 is about 14352.3460103218. The cubic root of 205989836 is about 590.5843449373.

The spelling of 205989836 in words is "two hundred five million, nine hundred eighty-nine thousand, eight hundred thirty-six".