20023177676681 has 2 divisors, whose sum is σ = 20023177676682. Its totient is φ = 20023177676680.

The previous prime is 20023177676639. The next prime is 20023177676693. The reversal of 20023177676681 is 18667677132002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18070227326281 + 1952950350400 = 4250909^2 + 1397480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20023177676681 is a prime.

It is a super-2 number, since 2×20023177676681² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20023177676081) 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, 10011588838340 + 10011588838341.

It is an arithmetic number, because the mean of its divisors is an integer number (10011588838341).

Almost surely, 2^{20023177676681} is an apocalyptic number.

It is an amenable number.

20023177676681 is a deficient number, since it is larger than the sum of its proper divisors (1).

20023177676681 is an equidigital number, since it uses as much as digits as its factorization.

20023177676681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7112448, while the sum is 56.

The spelling of 20023177676681 in words is "twenty trillion, twenty-three billion, one hundred seventy-seven million, six hundred seventy-six thousand, six hundred eighty-one".