23220145 has 16 divisors (see below), whose sum is σ = 30742992. Its totient is φ = 16727040.

The previous prime is 23220139. The next prime is 23220149. The reversal of 23220145 is 54102232.

It can be written as a sum of positive squares in 8 ways, for example, as 1327104 + 21893041 = 1152^2 + 4679^2 .

It is not a de Polignac number, because 23220145 - 2¹⁹ = 22695857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23220149) 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 15 ways as a sum of consecutive naturals, for example, 1692 + ... + 7021.

It is an arithmetic number, because the mean of its divisors is an integer number (1921437).

Almost surely, 2^23220145 is an apocalyptic number.

It is an amenable number.

23220145 is a deficient number, since it is larger than the sum of its proper divisors (7522847).

23220145 is a wasteful number, since it uses less digits than its factorization.

23220145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8772.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 23220145 is about 4818.7285667487. The cubic root of 23220145 is about 285.2911562339.

Adding to 23220145 its reverse (54102232), we get a palindrome (77322377).

The spelling of 23220145 in words is "twenty-three million, two hundred twenty thousand, one hundred forty-five".