20422517 has 2 divisors, whose sum is σ = 20422518. Its totient is φ = 20422516.

The previous prime is 20422513. The next prime is 20422579. The reversal of 20422517 is 71522402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20421361 + 1156 = 4519^2 + 34^2 .

It is a cyclic number.

It is not a de Polignac number, because 20422517 - 2² = 20422513 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20422492 and 20422501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20422513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211258 + 10211259.

It is an arithmetic number, because the mean of its divisors is an integer number (10211259).

Almost surely, 2^20422517 is an apocalyptic number.

It is an amenable number.

20422517 is a deficient number, since it is larger than the sum of its proper divisors (1).

20422517 is an equidigital number, since it uses as much as digits as its factorization.

20422517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 20422517 is about 4519.1279025936. The cubic root of 20422517 is about 273.3399362210.

Adding to 20422517 its reverse (71522402), we get a palindrome (91944919).

The spelling of 20422517 in words is "twenty million, four hundred twenty-two thousand, five hundred seventeen".