23205145 has 4 divisors (see below), whose sum is σ = 27846180. Its totient is φ = 18564112.

The previous prime is 23205109. The next prime is 23205181. The reversal of 23205145 is 54150232.

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

It is an interprime number because it is at equal distance from previous prime (23205109) and next prime (23205181).

It can be written as a sum of positive squares in 2 ways, for example, as 13601344 + 9603801 = 3688^2 + 3099^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23205145 is a prime.

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, 2320510 + ... + 2320519.

It is an arithmetic number, because the mean of its divisors is an integer number (6961545).

Almost surely, 2^23205145 is an apocalyptic number.

It is an amenable number.

23205145 is a deficient number, since it is larger than the sum of its proper divisors (4641035).

23205145 is an equidigital number, since it uses as much as digits as its factorization.

23205145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4641034.

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

The square root of 23205145 is about 4817.1718881518. The cubic root of 23205145 is about 285.2297111805.

Adding to 23205145 its reverse (54150232), we get a palindrome (77355377).

The spelling of 23205145 in words is "twenty-three million, two hundred five thousand, one hundred forty-five".