206813685 has 32 divisors (see below), whose sum is σ = 363097728. Its totient is φ = 99889920.

The previous prime is 206813671. The next prime is 206813743. The reversal of 206813685 is 586318602.

It is a happy number.

It is not a de Polignac number, because 206813685 - 2⁸ = 206813429 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 330 + ... + 20340.

It is an arithmetic number, because the mean of its divisors is an integer number (11346804).

Almost surely, 2^206813685 is an apocalyptic number.

It is an amenable number.

206813685 is a deficient number, since it is larger than the sum of its proper divisors (156284043).

206813685 is a wasteful number, since it uses less digits than its factorization.

206813685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20085.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 206813685 is about 14381.0182184712. The cubic root of 206813685 is about 591.3706379559.

It can be divided in two parts, 2068 and 13685, that added together give a triangular number (15753 = T₁₇₇).

The spelling of 206813685 in words is "two hundred six million, eight hundred thirteen thousand, six hundred eighty-five".