20688788839 has 2 divisors, whose sum is σ = 20688788840. Its totient is φ = 20688788838.

The previous prime is 20688788833. The next prime is 20688788849. The reversal of 20688788839 is 93888788602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20688788839 - 2¹⁵ = 20688756071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20688788833) 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, 10344394419 + 10344394420.

It is an arithmetic number, because the mean of its divisors is an integer number (10344394420).

Almost surely, 2^20688788839 is an apocalyptic number.

20688788839 is a deficient number, since it is larger than the sum of its proper divisors (1).

20688788839 is an equidigital number, since it uses as much as digits as its factorization.

20688788839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 74317824, while the sum is 67.

The spelling of 20688788839 in words is "twenty billion, six hundred eighty-eight million, seven hundred eighty-eight thousand, eight hundred thirty-nine".