20971982128 has 40 divisors (see below), whose sum is σ = 41663837808. Its totient is φ = 10222547712.

The previous prime is 20971982111. The next prime is 20971982167. The reversal of 20971982128 is 82128917902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54375 + ... + 211897.

Almost surely, 2^20971982128 is an apocalyptic number.

It is an amenable number.

20971982128 is a deficient number, since it is larger than the sum of its proper divisors (20691855680).

20971982128 is a wasteful number, since it uses less digits than its factorization.

20971982128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157741 (or 157735 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 49.

The spelling of 20971982128 in words is "twenty billion, nine hundred seventy-one million, nine hundred eighty-two thousand, one hundred twenty-eight".