206228905 has 4 divisors (see below), whose sum is σ = 247474692. Its totient is φ = 164983120.

The previous prime is 206228899. The next prime is 206228909. The reversal of 206228905 is 509822602.

206228905 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 can be written as a sum of positive squares in 2 ways, for example, as 67436944 + 138791961 = 8212^2 + 11781^2 .

It is not a de Polignac number, because 206228905 - 2¹¹ = 206226857 is a prime.

It is a super-2 number, since 2×206228905² = 85060722514998050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206228909) 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, 20622886 + ... + 20622895.

It is an arithmetic number, because the mean of its divisors is an integer number (61868673).

Almost surely, 2^206228905 is an apocalyptic number.

It is an amenable number.

206228905 is a deficient number, since it is larger than the sum of its proper divisors (41245787).

206228905 is an equidigital number, since it uses as much as digits as its factorization.

206228905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41245786.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 206228905 is about 14360.6721639344. The cubic root of 206228905 is about 590.8127313235.

The spelling of 206228905 in words is "two hundred six million, two hundred twenty-eight thousand, nine hundred five".