20106807681 has 24 divisors (see below), whose sum is σ = 28576404864. Its totient is φ = 12572819200.

The previous prime is 20106807673. The next prime is 20106807683. The reversal of 20106807681 is 18670860102.

It is not a de Polignac number, because 20106807681 - 2³ = 20106807673 is a prime.

It is a super-2 number, since 2×20106807681² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20106807683) 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, 214456 + ... + 293606.

It is an arithmetic number, because the mean of its divisors is an integer number (1190683536).

Almost surely, 2^20106807681 is an apocalyptic number.

It is an amenable number.

20106807681 is a deficient number, since it is larger than the sum of its proper divisors (8469597183).

20106807681 is a wasteful number, since it uses less digits than its factorization.

20106807681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79481 (or 79464 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The spelling of 20106807681 in words is "twenty billion, one hundred six million, eight hundred seven thousand, six hundred eighty-one".