20075821117 has 6 divisors (see below), whose sum is σ = 22066811774. Its totient is φ = 18250746360.

The previous prime is 20075821109. The next prime is 20075821153. The reversal of 20075821117 is 71112857002.

It can be written as a sum of positive squares in only one way, i.e., 19992263236 + 83557881 = 141394^2 + 9141^2 .

It is not a de Polignac number, because 20075821117 - 2³ = 20075821109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20075821817) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 82957818 + ... + 82958059.

Almost surely, 2^20075821117 is an apocalyptic number.

It is an amenable number.

20075821117 is a deficient number, since it is larger than the sum of its proper divisors (1990990657).

20075821117 is a wasteful number, since it uses less digits than its factorization.

20075821117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165915899 (or 165915888 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 34.

The spelling of 20075821117 in words is "twenty billion, seventy-five million, eight hundred twenty-one thousand, one hundred seventeen".