205563397 has 32 divisors (see below), whose sum is σ = 242081280. Its totient is φ = 172972800.

The previous prime is 205563367. The next prime is 205563403. The reversal of 205563397 is 793365502.

It is not a de Polignac number, because 205563397 - 2²⁷ = 71345669 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205563317) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1309243 + ... + 1309399.

It is an arithmetic number, because the mean of its divisors is an integer number (7565040).

Almost surely, 2^205563397 is an apocalyptic number.

It is an amenable number.

205563397 is a deficient number, since it is larger than the sum of its proper divisors (36517883).

205563397 is a wasteful number, since it uses less digits than its factorization.

205563397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373.

The product of its (nonzero) digits is 170100, while the sum is 40.

The square root of 205563397 is about 14337.4822406167. The cubic root of 205563397 is about 590.1765219203.

The spelling of 205563397 in words is "two hundred five million, five hundred sixty-three thousand, three hundred ninety-seven".