206855920 has 40 divisors (see below), whose sum is σ = 486750096. Its totient is φ = 81742848.

The previous prime is 206855917. The next prime is 206855921. The reversal of 206855920 is 29558602.

It is a happy number.

206855920 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 206855920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206855921) 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, 8937 + ... + 22216.

Almost surely, 2^206855920 is an apocalyptic number.

206855920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206855920 is an abundant number, since it is smaller than the sum of its proper divisors (279894176).

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

206855920 is a wasteful number, since it uses less digits than its factorization.

206855920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31249 (or 31243 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 206855920 is about 14382.4865722169. The cubic root of 206855920 is about 591.4108913187.

The spelling of 206855920 in words is "two hundred six million, eight hundred fifty-five thousand, nine hundred twenty".