20789790799 has 2 divisors, whose sum is σ = 20789790800. Its totient is φ = 20789790798.

The previous prime is 20789790793. The next prime is 20789790809. The reversal of 20789790799 is 99709798702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20789790799 - 2⁵ = 20789790767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20789790793) 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, 10394895399 + 10394895400.

It is an arithmetic number, because the mean of its divisors is an integer number (10394895400).

Almost surely, 2^20789790799 is an apocalyptic number.

20789790799 is a deficient number, since it is larger than the sum of its proper divisors (1).

20789790799 is an equidigital number, since it uses as much as digits as its factorization.

20789790799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36006768, while the sum is 67.

The spelling of 20789790799 in words is "twenty billion, seven hundred eighty-nine million, seven hundred ninety thousand, seven hundred ninety-nine".