20663655535 has 16 divisors (see below), whose sum is σ = 24944025600.
Its totient is φ = 16432653600.
The previous prime is 20663655497. The next prime is 20663655539. The reversal of 20663655535 is 53555636602.
It is a happy number.
It is not a de Polignac number, because 20663655535 - 27 = 20663655407 is a prime.
It is a super-2 number, since 2×206636555352 (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 in 15 ways as a sum of consecutive naturals, for example, 1136224 + ... + 1154266.
It is an arithmetic number, because the mean of its divisors is an integer number (1559001600).
Almost surely, 220663655535 is an apocalyptic number.
20663655535 is a deficient number, since it is larger than the sum of its proper divisors (4280370065).
20663655535 is a wasteful number, since it uses less digits than its factorization.
20663655535 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 19398.
The product of its (nonzero) digits is 2430000, while the sum is 46.
The spelling of 20663655535 in words is "twenty billion, six hundred sixty-three million, six hundred fifty-five thousand, five hundred thirty-five".