20919462779 has 2 divisors, whose sum is σ = 20919462780. Its totient is φ = 20919462778.

The previous prime is 20919462763. The next prime is 20919462901. The reversal of 20919462779 is 97726491902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20919462779 - 2⁴ = 20919462763 is a prime.

It is not a weakly prime, because it can be changed into another prime (20919462379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10459731389 + 10459731390.

It is an arithmetic number, because the mean of its divisors is an integer number (10459731390).

Almost surely, 2^20919462779 is an apocalyptic number.

20919462779 is a deficient number, since it is larger than the sum of its proper divisors (1).

20919462779 is an equidigital number, since it uses as much as digits as its factorization.

20919462779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3429216, while the sum is 56.

The spelling of 20919462779 in words is "twenty billion, nine hundred nineteen million, four hundred sixty-two thousand, seven hundred seventy-nine".