22045809 has 4 divisors (see below), whose sum is σ = 29394416. Its totient is φ = 14697204.

The previous prime is 22045801. The next prime is 22045813. The reversal of 22045809 is 90854022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22045809 - 2³ = 22045801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22045801) 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, 3674299 + ... + 3674304.

It is an arithmetic number, because the mean of its divisors is an integer number (7348604).

Almost surely, 2^22045809 is an apocalyptic number.

It is an amenable number.

22045809 is a deficient number, since it is larger than the sum of its proper divisors (7348607).

22045809 is an equidigital number, since it uses as much as digits as its factorization.

22045809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7348606.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 22045809 is about 4695.2964762622. The cubic root of 22045809 is about 280.3982809928.

The spelling of 22045809 in words is "twenty-two million, forty-five thousand, eight hundred nine".