20976631168 has 32 divisors (see below), whose sum is σ = 42292890360.
Its totient is φ = 10361945088.
The previous prime is 20976631157. The next prime is 20976631229. The reversal of 20976631168 is 86113667902.
It is a tau number, because it is divible by the number of its divisors (32).
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 3 ways as a sum of consecutive naturals, for example, 976605 + ... + 997852.
Almost surely, 220976631168 is an apocalyptic number.
It is an amenable number.
20976631168 is an abundant number, since it is smaller than the sum of its proper divisors (21316259192).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20976631168 is an equidigital number, since it uses as much as digits as its factorization.
20976631168 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1974554 (or 1974542 counting only the distinct ones).
The product of its (nonzero) digits is 653184, while the sum is 49.
The spelling of 20976631168 in words is "twenty billion, nine hundred seventy-six million, six hundred thirty-one thousand, one hundred sixty-eight".