20422189 has 2 divisors, whose sum is σ = 20422190. Its totient is φ = 20422188.

The previous prime is 20422159. The next prime is 20422243. The reversal of 20422189 is 98122402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20097289 + 324900 = 4483^2 + 570^2 .

It is a cyclic number.

It is not a de Polignac number, because 20422189 - 2¹³ = 20413997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20422139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211094 + 10211095.

It is an arithmetic number, because the mean of its divisors is an integer number (10211095).

Almost surely, 2^20422189 is an apocalyptic number.

It is an amenable number.

20422189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20422189 is an equidigital number, since it uses as much as digits as its factorization.

20422189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20422189 is about 4519.0916122601. The cubic root of 20422189 is about 273.3384728692.

The spelling of 20422189 in words is "twenty million, four hundred twenty-two thousand, one hundred eighty-nine".