20636720029 has 2 divisors, whose sum is σ = 20636720030. Its totient is φ = 20636720028.

The previous prime is 20636720017. The next prime is 20636720099. The reversal of 20636720029 is 92002763602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18667756900 + 1968963129 = 136630^2 + 44373^2 .

It is a cyclic number.

It is not a de Polignac number, because 20636720029 - 2²³ = 20628331421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20636720029.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20636720009) 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, 10318360014 + 10318360015.

It is an arithmetic number, because the mean of its divisors is an integer number (10318360015).

Almost surely, 2^20636720029 is an apocalyptic number.

It is an amenable number.

20636720029 is a deficient number, since it is larger than the sum of its proper divisors (1).

20636720029 is an equidigital number, since it uses as much as digits as its factorization.

20636720029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 37.

The spelling of 20636720029 in words is "twenty billion, six hundred thirty-six million, seven hundred twenty thousand, twenty-nine".