20681207105 has 16 divisors (see below), whose sum is σ = 26971689360. Its totient is φ = 15132158208.

The previous prime is 20681207093. The next prime is 20681207147. The reversal of 20681207105 is 50170218602.

It can be written as a sum of positive squares in 8 ways, for example, as 256224049 + 20424983056 = 16007^2 + 142916^2 .

It is a cyclic number.

It is not a de Polignac number, because 20681207105 - 2⁴ = 20681207089 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1452422 + ... + 1466591.

It is an arithmetic number, because the mean of its divisors is an integer number (1685730585).

Almost surely, 2^20681207105 is an apocalyptic number.

It is an amenable number.

20681207105 is a deficient number, since it is larger than the sum of its proper divisors (6290482255).

20681207105 is a wasteful number, since it uses less digits than its factorization.

20681207105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2919140.

The product of its (nonzero) digits is 6720, while the sum is 32.

The spelling of 20681207105 in words is "twenty billion, six hundred eighty-one million, two hundred seven thousand, one hundred five".