206355640 has 32 divisors (see below), whose sum is σ = 464723280. Its totient is φ = 82467072.

The previous prime is 206355631. The next prime is 206355641. The reversal of 206355640 is 46553602.

206355640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206355641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68404 + ... + 71356.

Almost surely, 2^206355640 is an apocalyptic number.

206355640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206355640 is an abundant number, since it is smaller than the sum of its proper divisors (258367640).

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

206355640 is a wasteful number, since it uses less digits than its factorization.

206355640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4711 (or 4707 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 206355640 is about 14365.0840582295. The cubic root of 206355640 is about 590.9337316890.

The spelling of 206355640 in words is "two hundred six million, three hundred fifty-five thousand, six hundred forty".