20666854108 has 24 divisors (see below), whose sum is σ = 36450924048. Its totient is φ = 10252521216.

The previous prime is 20666854081. The next prime is 20666854111. The reversal of 20666854108 is 80145866602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359910 + ... + 413362.

It is an arithmetic number, because the mean of its divisors is an integer number (1518788502).

Almost surely, 2^20666854108 is an apocalyptic number.

It is an amenable number.

20666854108 is a deficient number, since it is larger than the sum of its proper divisors (15784069940).

20666854108 is a wasteful number, since it uses less digits than its factorization.

20666854108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54213 (or 54211 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 46.

The spelling of 20666854108 in words is "twenty billion, six hundred sixty-six million, eight hundred fifty-four thousand, one hundred eight".