205663983 has 16 divisors (see below), whose sum is σ = 315651840. Its totient is φ = 116675136.

The previous prime is 205663981. The next prime is 205663987. The reversal of 205663983 is 389366502.

It is not a de Polignac number, because 205663983 - 2¹ = 205663981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205663981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32310 + ... + 38147.

It is an arithmetic number, because the mean of its divisors is an integer number (19728240).

Almost surely, 2^205663983 is an apocalyptic number.

205663983 is a deficient number, since it is larger than the sum of its proper divisors (109987857).

205663983 is a wasteful number, since it uses less digits than its factorization.

205663983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70606.

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 205663983 is about 14340.9896102047. The cubic root of 205663983 is about 590.2727676796.

The spelling of 205663983 in words is "two hundred five million, six hundred sixty-three thousand, nine hundred eighty-three".