20686433766861 has 16 divisors (see below), whose sum is σ = 27717842563200. Its totient is φ = 13723114097088.

The previous prime is 20686433766847. The next prime is 20686433766893. The reversal of 20686433766861 is 16866733468602.

It is not a de Polignac number, because 20686433766861 - 2²⁶ = 20686366657997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20686433766792 and 20686433766801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20686433766821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14791641 + ... + 16129646.

It is an arithmetic number, because the mean of its divisors is an integer number (1732365160200).

Almost surely, 2^{20686433766861} is an apocalyptic number.

It is an amenable number.

20686433766861 is a deficient number, since it is larger than the sum of its proper divisors (7031408796339).

20686433766861 is a wasteful number, since it uses less digits than its factorization.

20686433766861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30922388.

The product of its (nonzero) digits is 250822656, while the sum is 66.

The spelling of 20686433766861 in words is "twenty trillion, six hundred eighty-six billion, four hundred thirty-three million, seven hundred sixty-six thousand, eight hundred sixty-one".