22520809 has 2 divisors, whose sum is σ = 22520810. Its totient is φ = 22520808.

The previous prime is 22520807. The next prime is 22520821. The reversal of 22520809 is 90802522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21576025 + 944784 = 4645^2 + 972^2 .

It is a cyclic number.

It is not a de Polignac number, because 22520809 - 2¹ = 22520807 is a prime.

Together with 22520807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (22520803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11260404 + 11260405.

It is an arithmetic number, because the mean of its divisors is an integer number (11260405).

Almost surely, 2^22520809 is an apocalyptic number.

It is an amenable number.

22520809 is a deficient number, since it is larger than the sum of its proper divisors (1).

22520809 is an equidigital number, since it uses as much as digits as its factorization.

22520809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 22520809 is about 4745.6094445287. The cubic root of 22520809 is about 282.3978130423.

The spelling of 22520809 in words is "twenty-two million, five hundred twenty thousand, eight hundred nine".