20023721659 has 2 divisors, whose sum is σ = 20023721660. Its totient is φ = 20023721658.

The previous prime is 20023721633. The next prime is 20023721689. The reversal of 20023721659 is 95612732002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20023721659 - 2³¹ = 17876238011 is a prime.

It is not a weakly prime, because it can be changed into another prime (20023721689) 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, 10011860829 + 10011860830.

It is an arithmetic number, because the mean of its divisors is an integer number (10011860830).

Almost surely, 2^20023721659 is an apocalyptic number.

20023721659 is a deficient number, since it is larger than the sum of its proper divisors (1).

20023721659 is an equidigital number, since it uses as much as digits as its factorization.

20023721659 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 20023721659 in words is "twenty billion, twenty-three million, seven hundred twenty-one thousand, six hundred fifty-nine".