20085379709 has 2 divisors, whose sum is σ = 20085379710. Its totient is φ = 20085379708.

The previous prime is 20085379697. The next prime is 20085379711. The reversal of 20085379709 is 90797358002.

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., 17339095684 + 2746284025 = 131678^2 + 52405^2 .

It is a cyclic number.

It is not a de Polignac number, because 20085379709 - 2¹² = 20085375613 is a prime.

Together with 20085379711, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20085379799) 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, 10042689854 + 10042689855.

It is an arithmetic number, because the mean of its divisors is an integer number (10042689855).

Almost surely, 2^20085379709 is an apocalyptic number.

It is an amenable number.

20085379709 is a deficient number, since it is larger than the sum of its proper divisors (1).

20085379709 is an equidigital number, since it uses as much as digits as its factorization.

20085379709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 952560, while the sum is 50.

The spelling of 20085379709 in words is "twenty billion, eighty-five million, three hundred seventy-nine thousand, seven hundred nine".