205868013 has 32 divisors (see below), whose sum is σ = 307722240. Its totient is φ = 121551360.

The previous prime is 205867999. The next prime is 205868029. The reversal of 205868013 is 310868502.

It is a happy number.

It is not a de Polignac number, because 205868013 - 2¹⁶ = 205802477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205868063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 215545 + ... + 216497.

It is an arithmetic number, because the mean of its divisors is an integer number (9616320).

Almost surely, 2^205868013 is an apocalyptic number.

It is an amenable number.

205868013 is a deficient number, since it is larger than the sum of its proper divisors (101854227).

205868013 is a wasteful number, since it uses less digits than its factorization.

205868013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 205868013 is about 14348.1013726555. The cubic root of 205868013 is about 590.4678975341.

The spelling of 205868013 in words is "two hundred five million, eight hundred sixty-eight thousand, thirteen".