20801969268673 has 2 divisors, whose sum is σ = 20801969268674. Its totient is φ = 20801969268672.

The previous prime is 20801969268607. The next prime is 20801969268727. The reversal of 20801969268673 is 37686296910802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20061288714289 + 740680554384 = 4478983^2 + 860628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20801969268673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20801969268599 and 20801969268608.

It is not a weakly prime, because it can be changed into another prime (20801960268673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10400984634336 + 10400984634337.

It is an arithmetic number, because the mean of its divisors is an integer number (10400984634337).

Almost surely, 2^{20801969268673} is an apocalyptic number.

It is an amenable number.

20801969268673 is a deficient number, since it is larger than the sum of its proper divisors (1).

20801969268673 is an equidigital number, since it uses as much as digits as its factorization.

20801969268673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94058496, while the sum is 67.

The spelling of 20801969268673 in words is "twenty trillion, eight hundred one billion, nine hundred sixty-nine million, two hundred sixty-eight thousand, six hundred seventy-three".