20344172689 has 9 divisors (see below), whose sum is σ = 21474134217. Its totient is φ = 19270859364.

The previous prime is 20344172687. The next prime is 20344172699. The reversal of 20344172689 is 98627144302.

It is a happy number.

The square root of 20344172689 is 142633.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 20344172689 - 2¹ = 20344172687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20344172687) 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 in 8 ways as a sum of consecutive naturals, for example, 2706274 + ... + 2713780.

It is an arithmetic number, because the mean of its divisors is an integer number (2386014913).

Almost surely, 2^20344172689 is an apocalyptic number.

20344172689 is the 142633-rd square number.

20344172689 is the 71317-th centered octagonal number.

It is an amenable number.

20344172689 is a deficient number, since it is larger than the sum of its proper divisors (1129961528).

20344172689 is an frugal number, since it uses more digits than its factorization.

20344172689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15052 (or 7526 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 46.

The spelling of 20344172689 in words is "twenty billion, three hundred forty-four million, one hundred seventy-two thousand, six hundred eighty-nine".