206820684 has 72 divisors (see below), whose sum is σ = 603712928. Its totient is φ = 58475520.

The previous prime is 206820673. The next prime is 206820707. The reversal of 206820684 is 486028602.

206820684 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20214 + ... + 28674.

Almost surely, 2^206820684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206820684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301856464).

206820684 is an abundant number, since it is smaller than the sum of its proper divisors (396892244).

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

206820684 is a wasteful number, since it uses less digits than its factorization.

206820684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8575 (or 8570 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 206820684 is about 14381.2615580136. The cubic root of 206820684 is about 591.3773089465.

The spelling of 206820684 in words is "two hundred six million, eight hundred twenty thousand, six hundred eighty-four".