20655505663 has 48 divisors (see below), whose sum is σ = 24096268800. Its totient is φ = 17644573440.

The previous prime is 20655505627. The next prime is 20655505669. The reversal of 20655505663 is 36650555602.

It is not a de Polignac number, because 20655505663 - 2³³ = 12065571071 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 (20655505669) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27142203 + ... + 27142963.

It is an arithmetic number, because the mean of its divisors is an integer number (502005600).

Almost surely, 2^20655505663 is an apocalyptic number.

20655505663 is a deficient number, since it is larger than the sum of its proper divisors (3440763137).

20655505663 is a wasteful number, since it uses less digits than its factorization.

20655505663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992 (or 979 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 43.

The spelling of 20655505663 in words is "twenty billion, six hundred fifty-five million, five hundred five thousand, six hundred sixty-three".