20108071009 has 4 divisors (see below), whose sum is σ = 21654845716. Its totient is φ = 18561296304.

The previous prime is 20108070947. The next prime is 20108071079. The reversal of 20108071009 is 90017080102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12022464609 + 8085606400 = 109647^2 + 89920^2 .

It is a cyclic number.

It is not a de Polignac number, because 20108071009 - 2⁷ = 20108070881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20108071079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773387334 + ... + 773387359.

It is an arithmetic number, because the mean of its divisors is an integer number (5413711429).

Almost surely, 2^20108071009 is an apocalyptic number.

It is an amenable number.

20108071009 is a deficient number, since it is larger than the sum of its proper divisors (1546774707).

20108071009 is a wasteful number, since it uses less digits than its factorization.

20108071009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546774706.

The product of its (nonzero) digits is 1008, while the sum is 28.

The spelling of 20108071009 in words is "twenty billion, one hundred eight million, seventy-one thousand, nine".