23145205 has 4 divisors (see below), whose sum is σ = 27774252. Its totient is φ = 18516160.

The previous prime is 23145203. The next prime is 23145209. The reversal of 23145205 is 50254132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12432676 + 10712529 = 3526^2 + 3273^2 .

It is not a de Polignac number, because 23145205 - 2¹ = 23145203 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 (23145203) 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, 2314516 + ... + 2314525.

It is an arithmetic number, because the mean of its divisors is an integer number (6943563).

Almost surely, 2^23145205 is an apocalyptic number.

It is an amenable number.

23145205 is a deficient number, since it is larger than the sum of its proper divisors (4629047).

23145205 is an equidigital number, since it uses as much as digits as its factorization.

23145205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4629046.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 23145205 is about 4810.9463725966. The cubic root of 23145205 is about 284.9839120907.

Adding to 23145205 its reverse (50254132), we get a palindrome (73399337).

The spelling of 23145205 in words is "twenty-three million, one hundred forty-five thousand, two hundred five".