206155890 has 96 divisors (see below), whose sum is σ = 582566400. Its totient is φ = 50388480.

The previous prime is 206155861. The next prime is 206155907. The reversal of 206155890 is 98551602.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51066 + ... + 54954.

It is an arithmetic number, because the mean of its divisors is an integer number (6068400).

Almost surely, 2^206155890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206155890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291283200).

206155890 is an abundant number, since it is smaller than the sum of its proper divisors (376410510).

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

206155890 is a wasteful number, since it uses less digits than its factorization.

206155890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3952 (or 3949 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 206155890 is about 14358.1297528613. The cubic root of 206155890 is about 590.7429976723.

The spelling of 206155890 in words is "two hundred six million, one hundred fifty-five thousand, eight hundred ninety".