20622317 has 2 divisors, whose sum is σ = 20622318. Its totient is φ = 20622316.

The previous prime is 20622313. The next prime is 20622319. The reversal of 20622317 is 71322602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20484676 + 137641 = 4526^2 + 371^2 .

It is a cyclic number.

It is not a de Polignac number, because 20622317 - 2² = 20622313 is a prime.

Together with 20622319, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20622292 and 20622301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20622311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10311158 + 10311159.

It is an arithmetic number, because the mean of its divisors is an integer number (10311159).

Almost surely, 2^20622317 is an apocalyptic number.

It is an amenable number.

20622317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20622317 is an equidigital number, since it uses as much as digits as its factorization.

20622317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 20622317 is about 4541.1801329610. The cubic root of 20622317 is about 274.2284356021.

Adding to 20622317 its reverse (71322602), we get a palindrome (91944919).

The spelling of 20622317 in words is "twenty million, six hundred twenty-two thousand, three hundred seventeen".