20066860891 has 32 divisors (see below), whose sum is σ = 25303311360. Its totient is φ = 15458928000.

The previous prime is 20066860873. The next prime is 20066860897. The reversal of 20066860891 is 19806866002.

It is a cyclic number.

It is not a de Polignac number, because 20066860891 - 2⁷ = 20066860763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20066860897) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6896745 + ... + 6899653.

It is an arithmetic number, because the mean of its divisors is an integer number (790728480).

Almost surely, 2^20066860891 is an apocalyptic number.

20066860891 is a deficient number, since it is larger than the sum of its proper divisors (5236450469).

20066860891 is a wasteful number, since it uses less digits than its factorization.

20066860891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3915.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 20066860891 in words is "twenty billion, sixty-six million, eight hundred sixty thousand, eight hundred ninety-one".