20309955179 has 2 divisors, whose sum is σ = 20309955180. Its totient is φ = 20309955178.

The previous prime is 20309955161. The next prime is 20309955217. The reversal of 20309955179 is 97155990302.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20309955179 - 2²⁴ = 20293177963 is a prime.

It is not a weakly prime, because it can be changed into another prime (20309955109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10154977589 + 10154977590.

It is an arithmetic number, because the mean of its divisors is an integer number (10154977590).

Almost surely, 2^20309955179 is an apocalyptic number.

20309955179 is a deficient number, since it is larger than the sum of its proper divisors (1).

20309955179 is an equidigital number, since it uses as much as digits as its factorization.

20309955179 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 765450, while the sum is 50.

The spelling of 20309955179 in words is "twenty billion, three hundred nine million, nine hundred fifty-five thousand, one hundred seventy-nine".