205203823 has 4 divisors (see below), whose sum is σ = 223858728. Its totient is φ = 186548920.

The previous prime is 205203809. The next prime is 205203827. The reversal of 205203823 is 328302502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205203823 - 2¹³ = 205195631 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 (205203827) 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, 9327436 + ... + 9327457.

It is an arithmetic number, because the mean of its divisors is an integer number (55964682).

Almost surely, 2^205203823 is an apocalyptic number.

205203823 is a deficient number, since it is larger than the sum of its proper divisors (18654905).

205203823 is a wasteful number, since it uses less digits than its factorization.

205203823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18654904.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 205203823 is about 14324.9371028288. The cubic root of 205203823 is about 589.8322064263.

The spelling of 205203823 in words is "two hundred five million, two hundred three thousand, eight hundred twenty-three".