20822209 has 4 divisors (see below), whose sum is σ = 20870080. Its totient is φ = 20774340.

The previous prime is 20822201. The next prime is 20822227. The reversal of 20822209 is 90222802.

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 a cyclic number.

It is not a de Polignac number, because 20822209 - 2³ = 20822201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20822201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23277 + ... + 24154.

It is an arithmetic number, because the mean of its divisors is an integer number (5217520).

Almost surely, 2^20822209 is an apocalyptic number.

It is an amenable number.

20822209 is a deficient number, since it is larger than the sum of its proper divisors (47871).

20822209 is an equidigital number, since it uses as much as digits as its factorization.

20822209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47870.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20822209 is about 4563.1358734975. The cubic root of 20822209 is about 275.1116197023. Note that the first 3 decimals are identical.

The spelling of 20822209 in words is "twenty million, eight hundred twenty-two thousand, two hundred nine".