20122896809 has 2 divisors, whose sum is σ = 20122896810. Its totient is φ = 20122896808.

The previous prime is 20122896721. The next prime is 20122896841. The reversal of 20122896809 is 90869822102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12093840784 + 8029056025 = 109972^2 + 89605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20122896809 is a prime.

It is not a weakly prime, because it can be changed into another prime (20122896869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061448404 + 10061448405.

It is an arithmetic number, because the mean of its divisors is an integer number (10061448405).

Almost surely, 2^20122896809 is an apocalyptic number.

It is an amenable number.

20122896809 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122896809 is an equidigital number, since it uses as much as digits as its factorization.

20122896809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 47.

The spelling of 20122896809 in words is "twenty billion, one hundred twenty-two million, eight hundred ninety-six thousand, eight hundred nine".