206860905 has 16 divisors (see below), whose sum is σ = 367752960. Its totient is φ = 110325744.

The previous prime is 206860891. The next prime is 206860909. The reversal of 206860905 is 509068602.

It is not a de Polignac number, because 206860905 - 2¹¹ = 206858857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206860905.

It is not an unprimeable number, because it can be changed into a prime (206860909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 766017 + ... + 766286.

It is an arithmetic number, because the mean of its divisors is an integer number (22984560).

Almost surely, 2^206860905 is an apocalyptic number.

It is an amenable number.

206860905 is a deficient number, since it is larger than the sum of its proper divisors (160892055).

206860905 is a wasteful number, since it uses less digits than its factorization.

206860905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532317 (or 1532311 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 206860905 is about 14382.6598722211. The cubic root of 206860905 is about 591.4156420644.

The spelling of 206860905 in words is "two hundred six million, eight hundred sixty thousand, nine hundred five".