205306829893 has 4 divisors (see below), whose sum is σ = 223971087168. Its totient is φ = 186642572620.

The previous prime is 205306829891. The next prime is 205306829909. The reversal of 205306829893 is 398928603502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 205306829893 - 2¹ = 205306829891 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205306829891) 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, 9332128621 + ... + 9332128642.

It is an arithmetic number, because the mean of its divisors is an integer number (55992771792).

Almost surely, 2^205306829893 is an apocalyptic number.

It is an amenable number.

205306829893 is a deficient number, since it is larger than the sum of its proper divisors (18664257275).

205306829893 is a wasteful number, since it uses less digits than its factorization.

205306829893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18664257274.

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 205306829893 in words is "two hundred five billion, three hundred six million, eight hundred twenty-nine thousand, eight hundred ninety-three".