20345849779 has 2 divisors, whose sum is σ = 20345849780. Its totient is φ = 20345849778.

The previous prime is 20345849767. The next prime is 20345849807. The reversal of 20345849779 is 97794854302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20345849779 - 2⁷ = 20345849651 is a prime.

It is not a weakly prime, because it can be changed into another prime (20345849729) 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, 10172924889 + 10172924890.

It is an arithmetic number, because the mean of its divisors is an integer number (10172924890).

Almost surely, 2^20345849779 is an apocalyptic number.

20345849779 is a deficient number, since it is larger than the sum of its proper divisors (1).

20345849779 is an equidigital number, since it uses as much as digits as its factorization.

20345849779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15240960, while the sum is 58.

The spelling of 20345849779 in words is "twenty billion, three hundred forty-five million, eight hundred forty-nine thousand, seven hundred seventy-nine".