205031893 has 4 divisors (see below), whose sum is σ = 223671168. Its totient is φ = 186392620.

The previous prime is 205031873. The next prime is 205031909. The reversal of 205031893 is 398130502.

It is a happy number.

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 205031893 - 2¹³ = 205023701 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 (205031863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9319621 + ... + 9319642.

It is an arithmetic number, because the mean of its divisors is an integer number (55917792).

Almost surely, 2^205031893 is an apocalyptic number.

It is an amenable number.

205031893 is a deficient number, since it is larger than the sum of its proper divisors (18639275).

205031893 is a wasteful number, since it uses less digits than its factorization.

205031893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18639274.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 205031893 is about 14318.9347718327. The cubic root of 205031893 is about 589.6674301158.

The spelling of 205031893 in words is "two hundred five million, thirty-one thousand, eight hundred ninety-three".