20544330221 has 8 divisors (see below), whose sum is σ = 21797496000. Its totient is φ = 19296128448.

The previous prime is 20544330211. The next prime is 20544330259. The reversal of 20544330221 is 12203344502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20544330221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20544330211) 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 7 ways as a sum of consecutive naturals, for example, 1232471 + ... + 1249028.

It is an arithmetic number, because the mean of its divisors is an integer number (2724687000).

Almost surely, 2^20544330221 is an apocalyptic number.

It is an amenable number.

20544330221 is a deficient number, since it is larger than the sum of its proper divisors (1253165779).

20544330221 is a wasteful number, since it uses less digits than its factorization.

20544330221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2482003.

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 20544330221 its reverse (12203344502), we get a palindrome (32747674723).

The spelling of 20544330221 in words is "twenty billion, five hundred forty-four million, three hundred thirty thousand, two hundred twenty-one".