20719392877 has 2 divisors, whose sum is σ = 20719392878. Its totient is φ = 20719392876.

The previous prime is 20719392839. The next prime is 20719392893. The reversal of 20719392877 is 77829391702.

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., 17963772841 + 2755620036 = 134029^2 + 52494^2 .

It is a cyclic number.

It is not a de Polignac number, because 20719392877 - 2¹⁹ = 20718868589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20719392817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10359696438 + 10359696439.

It is an arithmetic number, because the mean of its divisors is an integer number (10359696439).

Almost surely, 2^20719392877 is an apocalyptic number.

It is an amenable number.

20719392877 is a deficient number, since it is larger than the sum of its proper divisors (1).

20719392877 is an equidigital number, since it uses as much as digits as its factorization.

20719392877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2667168, while the sum is 55.

The spelling of 20719392877 in words is "twenty billion, seven hundred nineteen million, three hundred ninety-two thousand, eight hundred seventy-seven".