20636646966 has 64 divisors (see below), whose sum is σ = 51986188800. Its totient is φ = 6015536928.

The previous prime is 20636646949. The next prime is 20636646971. The reversal of 20636646966 is 66964663602.

It is a happy number.

20636646966 is a `hidden beast` number, since 2 + 0 + 63 + 66 + 469 + 66 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 760266 + ... + 786941.

It is an arithmetic number, because the mean of its divisors is an integer number (812284200).

Almost surely, 2^20636646966 is an apocalyptic number.

20636646966 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20636646966 is an abundant number, since it is smaller than the sum of its proper divisors (31349541834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20636646966 is a wasteful number, since it uses less digits than its factorization.

20636646966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547250 (or 1547244 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 54.

The spelling of 20636646966 in words is "twenty billion, six hundred thirty-six million, six hundred forty-six thousand, nine hundred sixty-six".