22540645 has 4 divisors (see below), whose sum is σ = 27048780. Its totient is φ = 18032512.

The previous prime is 22540619. The next prime is 22540649. The reversal of 22540645 is 54604522.

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 7540516 + 15000129 = 2746^2 + 3873^2 .

It is a cyclic number.

It is not a de Polignac number, because 22540645 - 2¹⁷ = 22409573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22540649) 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, 2254060 + ... + 2254069.

It is an arithmetic number, because the mean of its divisors is an integer number (6762195).

Almost surely, 2^22540645 is an apocalyptic number.

It is an amenable number.

22540645 is a deficient number, since it is larger than the sum of its proper divisors (4508135).

22540645 is an equidigital number, since it uses as much as digits as its factorization.

22540645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4508134.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 22540645 is about 4747.6989163173. The cubic root of 22540645 is about 282.4806993366.

The spelling of 22540645 in words is "twenty-two million, five hundred forty thousand, six hundred forty-five".