20505342079 has 2 divisors, whose sum is σ = 20505342080. Its totient is φ = 20505342078.

The previous prime is 20505342061. The next prime is 20505342131. The reversal of 20505342079 is 97024350502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20505342079 - 2²⁵ = 20471787647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20505342029) 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, 10252671039 + 10252671040.

It is an arithmetic number, because the mean of its divisors is an integer number (10252671040).

Almost surely, 2^20505342079 is an apocalyptic number.

20505342079 is a deficient number, since it is larger than the sum of its proper divisors (1).

20505342079 is an equidigital number, since it uses as much as digits as its factorization.

20505342079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 37.

The spelling of 20505342079 in words is "twenty billion, five hundred five million, three hundred forty-two thousand, seventy-nine".