206373681 has 12 divisors (see below), whose sum is σ = 303148560. Its totient is φ = 135250200.

The previous prime is 206373667. The next prime is 206373697. The reversal of 206373681 is 186373602.

It is a happy number.

206373681 is a `hidden beast` number, since 206 + 373 + 6 + 81 = 666.

It is not a de Polignac number, because 206373681 - 2¹⁰ = 206372657 is a prime.

It is a super-2 number, since 2×206373681² = 85180192418979522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (206373631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 193795 + ... + 194856.

It is an arithmetic number, because the mean of its divisors is an integer number (25262380).

Almost surely, 2^206373681 is an apocalyptic number.

It is an amenable number.

206373681 is a deficient number, since it is larger than the sum of its proper divisors (96774879).

206373681 is a wasteful number, since it uses less digits than its factorization.

206373681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388716 (or 388713 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 206373681 is about 14365.7119907090. The cubic root of 206373681 is about 590.9509523229.

The spelling of 206373681 in words is "two hundred six million, three hundred seventy-three thousand, six hundred eighty-one".