20195906839 has 2 divisors, whose sum is σ = 20195906840. Its totient is φ = 20195906838.

The previous prime is 20195906833. The next prime is 20195906867. The reversal of 20195906839 is 93860959102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20195906839 - 2¹³ = 20195898647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20195906833) 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, 10097953419 + 10097953420.

It is an arithmetic number, because the mean of its divisors is an integer number (10097953420).

Almost surely, 2^20195906839 is an apocalyptic number.

20195906839 is a deficient number, since it is larger than the sum of its proper divisors (1).

20195906839 is an equidigital number, since it uses as much as digits as its factorization.

20195906839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1049760, while the sum is 52.

The spelling of 20195906839 in words is "twenty billion, one hundred ninety-five million, nine hundred six thousand, eight hundred thirty-nine".