22540405 has 4 divisors (see below), whose sum is σ = 27048492. Its totient is φ = 18032320.

The previous prime is 22540387. The next prime is 22540409. The reversal of 22540405 is 50404522.

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 16459249 + 6081156 = 4057^2 + 2466^2 .

It is not a de Polignac number, because 22540405 - 2⁵ = 22540373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22540409) 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, 2254036 + ... + 2254045.

It is an arithmetic number, because the mean of its divisors is an integer number (6762123).

Almost surely, 2^22540405 is an apocalyptic number.

It is an amenable number.

22540405 is a deficient number, since it is larger than the sum of its proper divisors (4508087).

22540405 is an equidigital number, since it uses as much as digits as its factorization.

22540405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4508086.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 22540405 is about 4747.6736408477. The cubic root of 22540405 is about 282.4796967683.

Adding to 22540405 its reverse (50404522), we get a palindrome (72944927).

The spelling of 22540405 in words is "twenty-two million, five hundred forty thousand, four hundred five".