20722796209 has 2 divisors, whose sum is σ = 20722796210. Its totient is φ = 20722796208.

The previous prime is 20722796183. The next prime is 20722796219. The reversal of 20722796209 is 90269722702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18933760000 + 1789036209 = 137600^2 + 42297^2 .

It is a cyclic number.

It is not a de Polignac number, because 20722796209 - 2⁹ = 20722795697 is a prime.

It is not a weakly prime, because it can be changed into another prime (20722796219) 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, 10361398104 + 10361398105.

It is an arithmetic number, because the mean of its divisors is an integer number (10361398105).

Almost surely, 2^20722796209 is an apocalyptic number.

It is an amenable number.

20722796209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20722796209 is an equidigital number, since it uses as much as digits as its factorization.

20722796209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 46.

The spelling of 20722796209 in words is "twenty billion, seven hundred twenty-two million, seven hundred ninety-six thousand, two hundred nine".