206155620 has 72 divisors (see below), whose sum is σ = 682194240. Its totient is φ = 49976640.

The previous prime is 206155613. The next prime is 206155657. The reversal of 206155620 is 26551602.

206155620 is a `hidden beast` number, since 20 + 6 + 15 + 5 + 620 = 666.

206155620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 50080 + ... + 54039.

It is an arithmetic number, because the mean of its divisors is an integer number (9474920).

Almost surely, 2^206155620 is an apocalyptic number.

206155620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206155620 is an abundant number, since it is smaller than the sum of its proper divisors (476038620).

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

206155620 is a wasteful number, since it uses less digits than its factorization.

206155620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104145 (or 104140 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 206155620 is about 14358.1203505194. The cubic root of 206155620 is about 590.7427397758.

The spelling of 206155620 in words is "two hundred six million, one hundred fifty-five thousand, six hundred twenty".