20320266677 has 2 divisors, whose sum is σ = 20320266678. Its totient is φ = 20320266676.

The previous prime is 20320266643. The next prime is 20320266709. The reversal of 20320266677 is 77666202302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18639348676 + 1680918001 = 136526^2 + 40999^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20320266677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20380266677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160133338 + 10160133339.

It is an arithmetic number, because the mean of its divisors is an integer number (10160133339).

Almost surely, 2^20320266677 is an apocalyptic number.

It is an amenable number.

20320266677 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320266677 is an equidigital number, since it uses as much as digits as its factorization.

20320266677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 41.

Adding to 20320266677 its reverse (77666202302), we get a palindrome (97986468979).

The spelling of 20320266677 in words is "twenty billion, three hundred twenty million, two hundred sixty-six thousand, six hundred seventy-seven".