20422309 has 2 divisors, whose sum is σ = 20422310. Its totient is φ = 20422308.

The previous prime is 20422277. The next prime is 20422313. The reversal of 20422309 is 90322402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15626209 + 4796100 = 3953^2 + 2190^2 .

It is a cyclic number.

It is not a de Polignac number, because 20422309 - 2⁵ = 20422277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20422309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20422609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211154 + 10211155.

It is an arithmetic number, because the mean of its divisors is an integer number (10211155).

Almost surely, 2^20422309 is an apocalyptic number.

It is an amenable number.

20422309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20422309 is an equidigital number, since it uses as much as digits as its factorization.

20422309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20422309 is about 4519.1048892452. The cubic root of 20422309 is about 273.3390082436.

The spelling of 20422309 in words is "twenty million, four hundred twenty-two thousand, three hundred nine".