20689320803 has 2 divisors, whose sum is σ = 20689320804. Its totient is φ = 20689320802.

The previous prime is 20689320793. The next prime is 20689320809. The reversal of 20689320803 is 30802398602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20689320803 - 2⁴ = 20689320787 is a prime.

It is not a weakly prime, because it can be changed into another prime (20689320809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10344660401 + 10344660402.

It is an arithmetic number, because the mean of its divisors is an integer number (10344660402).

Almost surely, 2^20689320803 is an apocalyptic number.

20689320803 is a deficient number, since it is larger than the sum of its proper divisors (1).

20689320803 is an equidigital number, since it uses as much as digits as its factorization.

20689320803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 20689320803 in words is "twenty billion, six hundred eighty-nine million, three hundred twenty thousand, eight hundred three".