20722245673 has 2 divisors, whose sum is σ = 20722245674. Its totient is φ = 20722245672.

The previous prime is 20722245637. The next prime is 20722245697. The reversal of 20722245673 is 37654222702.

Together with previous prime (20722245637) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10680602409 + 10041643264 = 103347^2 + 100208^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20722245673 is a prime.

It is a super-2 number, since 2×20722245673² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20722245473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10361122836 + 10361122837.

It is an arithmetic number, because the mean of its divisors is an integer number (10361122837).

Almost surely, 2^20722245673 is an apocalyptic number.

It is an amenable number.

20722245673 is a deficient number, since it is larger than the sum of its proper divisors (1).

20722245673 is an equidigital number, since it uses as much as digits as its factorization.

20722245673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282240, while the sum is 40.

The spelling of 20722245673 in words is "twenty billion, seven hundred twenty-two million, two hundred forty-five thousand, six hundred seventy-three".