20976642471839 has 2 divisors, whose sum is σ = 20976642471840. Its totient is φ = 20976642471838.

The previous prime is 20976642471803. The next prime is 20976642471923. The reversal of 20976642471839 is 93817424667902.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20976642471839 - 2⁴⁴ = 3384456427423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20976642471139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10488321235919 + 10488321235920.

It is an arithmetic number, because the mean of its divisors is an integer number (10488321235920).

Almost surely, 2^{20976642471839} is an apocalyptic number.

20976642471839 is a deficient number, since it is larger than the sum of its proper divisors (1).

20976642471839 is an equidigital number, since it uses as much as digits as its factorization.

20976642471839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 219469824, while the sum is 68.

The spelling of 20976642471839 in words is "twenty trillion, nine hundred seventy-six billion, six hundred forty-two million, four hundred seventy-one thousand, eight hundred thirty-nine".