20822189 has 2 divisors, whose sum is σ = 20822190. Its totient is φ = 20822188.

The previous prime is 20822183. The next prime is 20822201. The reversal of 20822189 is 98122802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12602500 + 8219689 = 3550^2 + 2867^2 .

It is a cyclic number.

It is not a de Polignac number, because 20822189 - 2²⁰ = 19773613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20822183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10411094 + 10411095.

It is an arithmetic number, because the mean of its divisors is an integer number (10411095).

Almost surely, 2^20822189 is an apocalyptic number.

It is an amenable number.

20822189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20822189 is an equidigital number, since it uses as much as digits as its factorization.

20822189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 20822189 is about 4563.1336820216. The cubic root of 20822189 is about 275.1115316196. Note that the first 3 decimals are identical.

The spelling of 20822189 in words is "twenty million, eight hundred twenty-two thousand, one hundred eighty-nine".