20681166626 has 32 divisors (see below), whose sum is σ = 33039040320. Its totient is φ = 9681336000.

The previous prime is 20681166619. The next prime is 20681166637. The reversal of 20681166626 is 62666118602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2186780 + ... + 2196216.

It is an arithmetic number, because the mean of its divisors is an integer number (1032470010).

Almost surely, 2^20681166626 is an apocalyptic number.

20681166626 is a deficient number, since it is larger than the sum of its proper divisors (12357873694).

20681166626 is a wasteful number, since it uses less digits than its factorization.

20681166626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10130.

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 20681166626 in words is "twenty billion, six hundred eighty-one million, one hundred sixty-six thousand, six hundred twenty-six".