20636720323 has 2 divisors, whose sum is σ = 20636720324. Its totient is φ = 20636720322.

The previous prime is 20636720239. The next prime is 20636720329. The reversal of 20636720323 is 32302763602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20636720323 is a prime.

It is not a weakly prime, because it can be changed into another prime (20636720329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10318360161 + 10318360162.

It is an arithmetic number, because the mean of its divisors is an integer number (10318360162).

Almost surely, 2^20636720323 is an apocalyptic number.

20636720323 is a deficient number, since it is larger than the sum of its proper divisors (1).

20636720323 is an equidigital number, since it uses as much as digits as its factorization.

20636720323 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 34.

The spelling of 20636720323 in words is "twenty billion, six hundred thirty-six million, seven hundred twenty thousand, three hundred twenty-three".