206443855 has 4 divisors (see below), whose sum is σ = 247732632. Its totient is φ = 165155080.

The previous prime is 206443847. The next prime is 206443859. The reversal of 206443855 is 558344602.

206443855 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 206443855 - 2³ = 206443847 is a prime.

It is a super-2 number, since 2×206443855² = 85238130534522050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206443859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20644381 + ... + 20644390.

It is an arithmetic number, because the mean of its divisors is an integer number (61933158).

Almost surely, 2^206443855 is an apocalyptic number.

206443855 is a deficient number, since it is larger than the sum of its proper divisors (41288777).

206443855 is an equidigital number, since it uses as much as digits as its factorization.

206443855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41288776.

The product of its (nonzero) digits is 115200, while the sum is 37.

The square root of 206443855 is about 14368.1541959989. The cubic root of 206443855 is about 591.0179258059.

The spelling of 206443855 in words is "two hundred six million, four hundred forty-three thousand, eight hundred fifty-five".