20681166627 has 24 divisors (see below), whose sum is σ = 33047509248. Its totient is φ = 12357500400.

The previous prime is 20681166619. The next prime is 20681166637. The reversal of 20681166627 is 72666118602.

It is not a de Polignac number, because 20681166627 - 2³ = 20681166619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20681166637) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1464103 + ... + 1478160.

It is an arithmetic number, because the mean of its divisors is an integer number (1376979552).

Almost surely, 2^20681166627 is an apocalyptic number.

20681166627 is a deficient number, since it is larger than the sum of its proper divisors (12366342621).

20681166627 is a wasteful number, since it uses less digits than its factorization.

20681166627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2942351 (or 2942348 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 20681166627 in words is "twenty billion, six hundred eighty-one million, one hundred sixty-six thousand, six hundred twenty-seven".