20666854107 has 40 divisors (see below), whose sum is σ = 31684246880. Its totient is φ = 13420131840.

The previous prime is 20666854081. The next prime is 20666854111. The reversal of 20666854107 is 70145866602.

It is a de Polignac number, because none of the positive numbers 2^k-20666854107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20666854177) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 488619 + ... + 529227.

It is an arithmetic number, because the mean of its divisors is an integer number (792106172).

Almost surely, 2^20666854107 is an apocalyptic number.

20666854107 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20666854107 is a deficient number, since it is larger than the sum of its proper divisors (11017392773).

20666854107 is a wasteful number, since it uses less digits than its factorization.

20666854107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40785 (or 40776 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 20666854107 in words is "twenty billion, six hundred sixty-six million, eight hundred fifty-four thousand, one hundred seven".