20865007439 has 2 divisors, whose sum is σ = 20865007440. Its totient is φ = 20865007438.

The previous prime is 20865007411. The next prime is 20865007459. The reversal of 20865007439 is 93470056802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20865007439 - 2³² = 16570040143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20865007439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20865007459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10432503719 + 10432503720.

It is an arithmetic number, because the mean of its divisors is an integer number (10432503720).

Almost surely, 2^20865007439 is an apocalyptic number.

20865007439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20865007439 is an equidigital number, since it uses as much as digits as its factorization.

20865007439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 20865007439 in words is "twenty billion, eight hundred sixty-five million, seven thousand, four hundred thirty-nine".