23120645 has 4 divisors (see below), whose sum is σ = 27744780. Its totient is φ = 18496512.

The previous prime is 23120641. The next prime is 23120651. The reversal of 23120645 is 54602132.

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 17123044 + 5997601 = 4138^2 + 2449^2 .

It is a cyclic number.

It is not a de Polignac number, because 23120645 - 2² = 23120641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23120645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23120641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2312060 + ... + 2312069.

It is an arithmetic number, because the mean of its divisors is an integer number (6936195).

Almost surely, 2^23120645 is an apocalyptic number.

It is an amenable number.

23120645 is a deficient number, since it is larger than the sum of its proper divisors (4624135).

23120645 is an equidigital number, since it uses as much as digits as its factorization.

23120645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4624134.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 23120645 is about 4808.3931827587. The cubic root of 23120645 is about 284.8830750488.

Adding to 23120645 its reverse (54602132), we get a palindrome (77722777).

The spelling of 23120645 in words is "twenty-three million, one hundred twenty thousand, six hundred forty-five".