20636720239 has 2 divisors, whose sum is σ = 20636720240. Its totient is φ = 20636720238.

The previous prime is 20636720233. The next prime is 20636720323. The reversal of 20636720239 is 93202763602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20636720239 - 2³ = 20636720231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20636720231) 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, 10318360119 + 10318360120.

It is an arithmetic number, because the mean of its divisors is an integer number (10318360120).

Almost surely, 2^20636720239 is an apocalyptic number.

20636720239 is a deficient number, since it is larger than the sum of its proper divisors (1).

20636720239 is an equidigital number, since it uses as much as digits as its factorization.

20636720239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 40.

The spelling of 20636720239 in words is "twenty billion, six hundred thirty-six million, seven hundred twenty thousand, two hundred thirty-nine".