20639436799 has 2 divisors, whose sum is σ = 20639436800. Its totient is φ = 20639436798.

The previous prime is 20639436761. The next prime is 20639436821. The reversal of 20639436799 is 99763493602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20639436799 - 2¹⁵ = 20639404031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20639436749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10319718399 + 10319718400.

It is an arithmetic number, because the mean of its divisors is an integer number (10319718400).

Almost surely, 2^20639436799 is an apocalyptic number.

20639436799 is a deficient number, since it is larger than the sum of its proper divisors (1).

20639436799 is an equidigital number, since it uses as much as digits as its factorization.

20639436799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13226976, while the sum is 58.

The spelling of 20639436799 in words is "twenty billion, six hundred thirty-nine million, four hundred thirty-six thousand, seven hundred ninety-nine".