206855620 has 24 divisors (see below), whose sum is σ = 436023000. Its totient is φ = 82432512.

The previous prime is 206855611. The next prime is 206855683. The reversal of 206855620 is 26558602.

It can be written as a sum of positive squares in 4 ways, for example, as 16581184 + 190274436 = 4072^2 + 13794^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 13845 + ... + 24604.

It is an arithmetic number, because the mean of its divisors is an integer number (18167625).

Almost surely, 2^206855620 is an apocalyptic number.

206855620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206855620 is an abundant number, since it is smaller than the sum of its proper divisors (229167380).

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

206855620 is a wasteful number, since it uses less digits than its factorization.

206855620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38727 (or 38725 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 206855620 is about 14382.4761428622. The cubic root of 206855620 is about 591.4106054138.

The spelling of 206855620 in words is "two hundred six million, eight hundred fifty-five thousand, six hundred twenty".