20195082709 has 2 divisors, whose sum is σ = 20195082710. Its totient is φ = 20195082708.

The previous prime is 20195082701. The next prime is 20195082751. The reversal of 20195082709 is 90728059102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20081724100 + 113358609 = 141710^2 + 10647^2 .

It is a cyclic number.

It is not a de Polignac number, because 20195082709 - 2³ = 20195082701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20195082701) 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, 10097541354 + 10097541355.

It is an arithmetic number, because the mean of its divisors is an integer number (10097541355).

Almost surely, 2^20195082709 is an apocalyptic number.

It is an amenable number.

20195082709 is a deficient number, since it is larger than the sum of its proper divisors (1).

20195082709 is an equidigital number, since it uses as much as digits as its factorization.

20195082709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 20195082709 in words is "twenty billion, one hundred ninety-five million, eighty-two thousand, seven hundred nine".