20840675239 has 2 divisors, whose sum is σ = 20840675240. Its totient is φ = 20840675238.

The previous prime is 20840675221. The next prime is 20840675249. The reversal of 20840675239 is 93257604802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20840675239 - 2²⁷ = 20706457511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20840675209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10420337619 + 10420337620.

It is an arithmetic number, because the mean of its divisors is an integer number (10420337620).

Almost surely, 2^20840675239 is an apocalyptic number.

20840675239 is a deficient number, since it is larger than the sum of its proper divisors (1).

20840675239 is an equidigital number, since it uses as much as digits as its factorization.

20840675239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 20840675239 in words is "twenty billion, eight hundred forty million, six hundred seventy-five thousand, two hundred thirty-nine".