20318529881663 has 24 divisors (see below), whose sum is σ = 22876977323760. Its totient is φ = 17937949518720.

The previous prime is 20318529881653. The next prime is 20318529881711. The reversal of 20318529881663 is 36618892581302.

It is a Cunningham number, because it is equal to 4507608²-1.

It is not a de Polignac number, because 20318529881663 - 2⁴ = 20318529881647 is a prime.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20318529881596 and 20318529881605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20318529881603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58425548 + ... + 58772286.

It is an arithmetic number, because the mean of its divisors is an integer number (953207388490).

Almost surely, 2^{20318529881663} is an apocalyptic number.

20318529881663 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20318529881663 is a deficient number, since it is larger than the sum of its proper divisors (2558447442097).

20318529881663 is a wasteful number, since it uses less digits than its factorization.

20318529881663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355319 (or 355296 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 62.

The spelling of 20318529881663 in words is "twenty trillion, three hundred eighteen billion, five hundred twenty-nine million, eight hundred eighty-one thousand, six hundred sixty-three".