20727723839 has 2 divisors, whose sum is σ = 20727723840. Its totient is φ = 20727723838.

The previous prime is 20727723833. The next prime is 20727723917. The reversal of 20727723839 is 93832772702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20727723839 - 2²⁸ = 20459288383 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20727723833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10363861919 + 10363861920.

It is an arithmetic number, because the mean of its divisors is an integer number (10363861920).

Almost surely, 2^20727723839 is an apocalyptic number.

20727723839 is a deficient number, since it is larger than the sum of its proper divisors (1).

20727723839 is an equidigital number, since it uses as much as digits as its factorization.

20727723839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1778112, while the sum is 50.

The spelling of 20727723839 in words is "twenty billion, seven hundred twenty-seven million, seven hundred twenty-three thousand, eight hundred thirty-nine".