205806045 has 8 divisors (see below), whose sum is σ = 329289696. Its totient is φ = 109763216.

The previous prime is 205806037. The next prime is 205806077. The reversal of 205806045 is 540608502.

205806045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205806045 - 2³ = 205806037 is a prime.

It is a super-2 number, since 2×205806045² = 84712256317084050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6860187 + ... + 6860216.

It is an arithmetic number, because the mean of its divisors is an integer number (41161212).

Almost surely, 2^205806045 is an apocalyptic number.

It is an amenable number.

205806045 is a deficient number, since it is larger than the sum of its proper divisors (123483651).

205806045 is a wasteful number, since it uses less digits than its factorization.

205806045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13720411.

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 205806045 is about 14345.9417606513. The cubic root of 205806045 is about 590.4086463241.

The spelling of 205806045 in words is "two hundred five million, eight hundred six thousand, forty-five".