206684681 has 16 divisors (see below), whose sum is σ = 240200448. Its totient is φ = 174182400.

The previous prime is 206684671. The next prime is 206684689. The reversal of 206684681 is 186486602.

It is not a de Polignac number, because 206684681 - 2²² = 202490377 is a prime.

It is a super-2 number, since 2×206684681² = 85437114720143522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206684689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 322121 + ... + 322761.

It is an arithmetic number, because the mean of its divisors is an integer number (15012528).

Almost surely, 2^206684681 is an apocalyptic number.

It is an amenable number.

206684681 is a deficient number, since it is larger than the sum of its proper divisors (33515767).

206684681 is an equidigital number, since it uses as much as digits as its factorization.

206684681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352.

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 206684681 is about 14376.5323009410. The cubic root of 206684681 is about 591.2476527909.

The spelling of 206684681 in words is "two hundred six million, six hundred eighty-four thousand, six hundred eighty-one".