20663655544 has 24 divisors (see below), whose sum is σ = 45069963840. Its totient is φ = 8855852208.

The previous prime is 20663655539. The next prime is 20663655557. The reversal of 20663655544 is 44555636602.

It is a junction number, because it is equal to n+sod(n) for n = 20663655494 and 20663655503.

It is a congruent number.

It is an unprimeable number.

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, 26356312 + ... + 26357095.

It is an arithmetic number, because the mean of its divisors is an integer number (1877915160).

Almost surely, 2^20663655544 is an apocalyptic number.

It is an amenable number.

20663655544 is an abundant number, since it is smaller than the sum of its proper divisors (24406308296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20663655544 is a wasteful number, since it uses less digits than its factorization.

20663655544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52713427 (or 52713416 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 46.

The spelling of 20663655544 in words is "twenty billion, six hundred sixty-three million, six hundred fifty-five thousand, five hundred forty-four".