205440023 has 8 divisors (see below), whose sum is σ = 211024128. Its totient is φ = 199930104.

The previous prime is 205439987. The next prime is 205440043. The reversal of 205440023 is 320044502.

205440023 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 205440023 - 2¹² = 205435927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205439977 and 205440004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205440043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12911 + ... + 24032.

It is an arithmetic number, because the mean of its divisors is an integer number (26378016).

Almost surely, 2^205440023 is an apocalyptic number.

205440023 is a deficient number, since it is larger than the sum of its proper divisors (5584105).

205440023 is an equidigital number, since it uses as much as digits as its factorization.

205440023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37093.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 205440023 is about 14333.1790960694. The cubic root of 205440023 is about 590.0584285715.

Adding to 205440023 its reverse (320044502), we get a palindrome (525484525).

The spelling of 205440023 in words is "two hundred five million, four hundred forty thousand, twenty-three".