206720684 has 12 divisors (see below), whose sum is σ = 380801400. Its totient is φ = 97920288.

The previous prime is 206720681. The next prime is 206720687. The reversal of 206720684 is 486027602.

It is an interprime number because it is at equal distance from previous prime (206720681) and next prime (206720687).

It is not an unprimeable number, because it can be changed into a prime (206720681) 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 3 ways as a sum of consecutive naturals, for example, 1359929 + ... + 1360080.

It is an arithmetic number, because the mean of its divisors is an integer number (31733450).

Almost surely, 2^206720684 is an apocalyptic number.

It is an amenable number.

206720684 is a deficient number, since it is larger than the sum of its proper divisors (174080716).

206720684 is a wasteful number, since it uses less digits than its factorization.

206720684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720032 (or 2720030 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 206720684 is about 14377.7843912058. The cubic root of 206720684 is about 591.2819811750.

The spelling of 206720684 in words is "two hundred six million, seven hundred twenty thousand, six hundred eighty-four".