20866676831 has 64 divisors (see below), whose sum is σ = 29548108800. Its totient is φ = 14191718400.

The previous prime is 20866676783. The next prime is 20866676881. The reversal of 20866676831 is 13867666802.

It is a cyclic number.

It is not a de Polignac number, because 20866676831 - 2²² = 20862482527 is a prime.

It is a super-2 number, since 2×20866676831² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20866676881) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17668061 + ... + 17669241.

It is an arithmetic number, because the mean of its divisors is an integer number (461689200).

Almost surely, 2^20866676831 is an apocalyptic number.

20866676831 is a deficient number, since it is larger than the sum of its proper divisors (8681431969).

20866676831 is a wasteful number, since it uses less digits than its factorization.

20866676831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160.

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 20866676831 in words is "twenty billion, eight hundred sixty-six million, six hundred seventy-six thousand, eight hundred thirty-one".