20604468689 has 6 divisors (see below), whose sum is σ = 23968463634. Its totient is φ = 17660973120.

The previous prime is 20604468683. The next prime is 20604468701. The reversal of 20604468689 is 98686440602.

It can be written as a sum of positive squares in only one way, i.e., 15821363089 + 4783105600 = 125783^2 + 69160^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20604468689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20604468689.

It is not an unprimeable number, because it can be changed into a prime (20604468683) 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 in 5 ways as a sum of consecutive naturals, for example, 210249632 + ... + 210249729.

It is an arithmetic number, because the mean of its divisors is an integer number (3994743939).

Almost surely, 2^20604468689 is an apocalyptic number.

It is an amenable number.

20604468689 is a deficient number, since it is larger than the sum of its proper divisors (3363994945).

20604468689 is an equidigital number, since it uses as much as digits as its factorization.

20604468689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420499375 (or 420499368 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 53.

The spelling of 20604468689 in words is "twenty billion, six hundred four million, four hundred sixty-eight thousand, six hundred eighty-nine".