20674497663 has 24 divisors (see below), whose sum is σ = 30510038208. Its totient is φ = 13484662272.

The previous prime is 20674497631. The next prime is 20674497689. The reversal of 20674497663 is 36679447602.

20674497663 is a `hidden beast` number, since 20 + 6 + 74 + 497 + 6 + 63 = 666.

It is not a de Polignac number, because 20674497663 - 2⁵ = 20674497631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20674495663) 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 23 ways as a sum of consecutive naturals, for example, 1353195 + ... + 1368387.

It is an arithmetic number, because the mean of its divisors is an integer number (1271251592).

Almost surely, 2^20674497663 is an apocalyptic number.

20674497663 is a deficient number, since it is larger than the sum of its proper divisors (9835540545).

20674497663 is a wasteful number, since it uses less digits than its factorization.

20674497663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18463 (or 18460 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 54.

The spelling of 20674497663 in words is "twenty billion, six hundred seventy-four million, four hundred ninety-seven thousand, six hundred sixty-three".