20344412661 has 12 divisors (see below), whose sum is σ = 27408452832. Its totient is φ = 13423099008.

The previous prime is 20344412629. The next prime is 20344412677. The reversal of 20344412661 is 16621444302.

It is a happy number.

It is not a de Polignac number, because 20344412661 - 2⁵ = 20344412629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20344412611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 332145 + ... + 388598.

It is an arithmetic number, because the mean of its divisors is an integer number (2284037736).

Almost surely, 2^20344412661 is an apocalyptic number.

It is an amenable number.

20344412661 is a deficient number, since it is larger than the sum of its proper divisors (7064040171).

20344412661 is an frugal number, since it uses more digits than its factorization.

20344412661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720940 (or 720843 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

Adding to 20344412661 its reverse (16621444302), we get a palindrome (36965856963).

The spelling of 20344412661 in words is "twenty billion, three hundred forty-four million, four hundred twelve thousand, six hundred sixty-one".