20663655536 has 10 divisors (see below), whose sum is σ = 40035832632.
Its totient is φ = 10331827760.
The previous prime is 20663655497. The next prime is 20663655539. The reversal of 20663655536 is 63555636602.
It is a super-2 number, since 2×206636555362 (a number of 21 digits) contains 22 as substring.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20663655539) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645739220 + ... + 645739251.
Almost surely, 220663655536 is an apocalyptic number.
It is an amenable number.
20663655536 is a deficient number, since it is larger than the sum of its proper divisors (19372177096).
20663655536 is a wasteful number, since it uses less digits than its factorization.
20663655536 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1291478479 (or 1291478473 counting only the distinct ones).
The product of its (nonzero) digits is 2916000, while the sum is 47.
The spelling of 20663655536 in words is "twenty billion, six hundred sixty-three million, six hundred fifty-five thousand, five hundred thirty-six".