23305145 has 4 divisors (see below), whose sum is σ = 27966180. Its totient is φ = 18644112.

The previous prime is 23305133. The next prime is 23305151. The reversal of 23305145 is 54150332.

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 15085456 + 8219689 = 3884^2 + 2867^2 .

It is a cyclic number.

It is not a de Polignac number, because 23305145 - 2⁶ = 23305081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23305145.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2330510 + ... + 2330519.

It is an arithmetic number, because the mean of its divisors is an integer number (6991545).

Almost surely, 2^23305145 is an apocalyptic number.

It is an amenable number.

23305145 is a deficient number, since it is larger than the sum of its proper divisors (4661035).

23305145 is an equidigital number, since it uses as much as digits as its factorization.

23305145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4661034.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 23305145 is about 4827.5402639439. The cubic root of 23305145 is about 285.6388459756.

Adding to 23305145 its reverse (54150332), we get a palindrome (77455477).

The spelling of 23305145 in words is "twenty-three million, three hundred five thousand, one hundred forty-five".