23220545 has 8 divisors (see below), whose sum is σ = 28178280. Its totient is φ = 18367360.

The previous prime is 23220529. The next prime is 23220551. The reversal of 23220545 is 54502232.

It can be written as a sum of positive squares in 4 ways, for example, as 142129 + 23078416 = 377^2 + 4804^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23220545 - 2⁴ = 23220529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23220545.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25646 + ... + 26535.

It is an arithmetic number, because the mean of its divisors is an integer number (3522285).

Almost surely, 2^23220545 is an apocalyptic number.

It is an amenable number.

23220545 is a deficient number, since it is larger than the sum of its proper divisors (4957735).

23220545 is an equidigital number, since it uses as much as digits as its factorization.

23220545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52275.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 23220545 is about 4818.7700712941. The cubic root of 23220545 is about 285.2927944064.

Adding to 23220545 its reverse (54502232), we get a palindrome (77722777).

The spelling of 23220545 in words is "twenty-three million, two hundred twenty thousand, five hundred forty-five".