20663655538 has 8 divisors (see below), whose sum is σ = 32343113088. Its totient is φ = 9882617844.

The previous prime is 20663655497. The next prime is 20663655539. The reversal of 20663655538 is 83555636602.

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

It is a junction number, because it is equal to n+sod(n) for n = 20663655491 and 20663655500.

It is not an unprimeable number, because it can be changed into a prime (20663655539) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 224604906 + ... + 224604997.

It is an arithmetic number, because the mean of its divisors is an integer number (4042889136).

Almost surely, 2^20663655538 is an apocalyptic number.

20663655538 is a deficient number, since it is larger than the sum of its proper divisors (11679457550).

20663655538 is a wasteful number, since it uses less digits than its factorization.

20663655538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449209928.

The product of its (nonzero) digits is 3888000, while the sum is 49.

The spelling of 20663655538 in words is "twenty billion, six hundred sixty-three million, six hundred fifty-five thousand, five hundred thirty-eight".