23205143 has 16 divisors (see below), whose sum is σ = 26191872. Its totient is φ = 20412000.

The previous prime is 23205109. The next prime is 23205181. The reversal of 23205143 is 34150232.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 23205143 - 2¹⁶ = 23139607 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 (23205443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28208 + ... + 29018.

It is an arithmetic number, because the mean of its divisors is an integer number (1636992).

Almost surely, 2^23205143 is an apocalyptic number.

23205143 is a deficient number, since it is larger than the sum of its proper divisors (2986729).

23205143 is a wasteful number, since it uses less digits than its factorization.

23205143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 23205143 is about 4817.1716805611. The cubic root of 23205143 is about 285.2297029860.

Adding to 23205143 its reverse (34150232), we get a palindrome (57355375).

The spelling of 23205143 in words is "twenty-three million, two hundred five thousand, one hundred forty-three".