20839704539 has 2 divisors, whose sum is σ = 20839704540. Its totient is φ = 20839704538.

The previous prime is 20839704511. The next prime is 20839704551. The reversal of 20839704539 is 93540793802.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20839704539 - 2⁸ = 20839704283 is a prime.

It is not a weakly prime, because it can be changed into another prime (20839704559) 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, 10419852269 + 10419852270.

It is an arithmetic number, because the mean of its divisors is an integer number (10419852270).

Almost surely, 2^20839704539 is an apocalyptic number.

20839704539 is a deficient number, since it is larger than the sum of its proper divisors (1).

20839704539 is an equidigital number, since it uses as much as digits as its factorization.

20839704539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The spelling of 20839704539 in words is "twenty billion, eight hundred thirty-nine million, seven hundred four thousand, five hundred thirty-nine".