20816663120 has 40 divisors (see below), whose sum is σ = 52798629600. Its totient is φ = 7569695360.

The previous prime is 20816663117. The next prime is 20816663167. The reversal of 20816663120 is 2136661802.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 11826770 + ... + 11828529.

It is an arithmetic number, because the mean of its divisors is an integer number (1319965740).

Almost surely, 2^20816663120 is an apocalyptic number.

20816663120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20816663120 is an abundant number, since it is smaller than the sum of its proper divisors (31981966480).

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

20816663120 is a wasteful number, since it uses less digits than its factorization.

20816663120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23655323 (or 23655317 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 20816663120 in words is "twenty billion, eight hundred sixteen million, six hundred sixty-three thousand, one hundred twenty".