20544348889 has 3 divisors (see below), whose sum is σ = 20544492223. Its totient is φ = 20544205556.

The previous prime is 20544348883. The next prime is 20544348893. The reversal of 20544348889 is 98884344502.

The square root of 20544348889 is 143333.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 126225225 + 20418123664 = 11235^2 + 142892^2 .

It is not a de Polignac number, because 20544348889 - 2¹³ = 20544340697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20544348883) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 71667 + ... + 214999.

Almost surely, 2^20544348889 is an apocalyptic number.

20544348889 is the 143333-rd square number.

20544348889 is the 71667-th centered octagonal number.

It is an amenable number.

20544348889 is a deficient number, since it is larger than the sum of its proper divisors (143334).

20544348889 is an frugal number, since it uses more digits than its factorization.

20544348889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286666 (or 143333 counting only the distinct ones).

The product of its (nonzero) digits is 8847360, while the sum is 55.

The spelling of 20544348889 in words is "twenty billion, five hundred forty-four million, three hundred forty-eight thousand, eight hundred eighty-nine".