20766846861 has 12 divisors (see below), whose sum is σ = 30694151488. Its totient is φ = 13522597704.

The previous prime is 20766846851. The next prime is 20766846949. The reversal of 20766846861 is 16864866702.

It is not a de Polignac number, because 20766846861 - 2⁷ = 20766846733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20766846798 and 20766846807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20766846851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26830165 + ... + 26830938.

Almost surely, 2^20766846861 is an apocalyptic number.

It is an amenable number.

20766846861 is a deficient number, since it is larger than the sum of its proper divisors (9927304627).

20766846861 is a wasteful number, since it uses less digits than its factorization.

20766846861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53661152 (or 53661149 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 20766846861 in words is "twenty billion, seven hundred sixty-six million, eight hundred forty-six thousand, eight hundred sixty-one".