206339805 has 56 divisors (see below), whose sum is σ = 424328832. Its totient is φ = 94315104.

The previous prime is 206339789. The next prime is 206339807. The reversal of 206339805 is 508933602.

It is not a de Polignac number, because 206339805 - 2⁴ = 206339789 is a prime.

It is a super-2 number, since 2×206339805² = 85152230254876050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 206339805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206339807) by changing a digit.

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 55 ways as a sum of consecutive naturals, for example, 21472 + ... + 29558.

Almost surely, 2^206339805 is an apocalyptic number.

It is an amenable number.

206339805 is an abundant number, since it is smaller than the sum of its proper divisors (217989027).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206339805 is an frugal number, since it uses more digits than its factorization.

206339805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8117 (or 8102 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 206339805 is about 14364.5328848522. The cubic root of 206339805 is about 590.9186159160.

The spelling of 206339805 in words is "two hundred six million, three hundred thirty-nine thousand, eight hundred five".