205808845 has 16 divisors (see below), whose sum is σ = 278115840. Its totient is φ = 144849600.

The previous prime is 205808789. The next prime is 205808873. The reversal of 205808845 is 548808502.

It is a happy number.

It is not a de Polignac number, because 205808845 - 2⁹ = 205808333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205808798 and 205808807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58650 + ... + 62059.

It is an arithmetic number, because the mean of its divisors is an integer number (17382240).

Almost surely, 2^205808845 is an apocalyptic number.

It is an amenable number.

205808845 is a deficient number, since it is larger than the sum of its proper divisors (72306995).

205808845 is a wasteful number, since it uses less digits than its factorization.

205808845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120756.

The product of its (nonzero) digits is 102400, while the sum is 40.

The square root of 205808845 is about 14346.0393488935. The cubic root of 205808845 is about 590.4113238235.

The spelling of 205808845 in words is "two hundred five million, eight hundred eight thousand, eight hundred forty-five".