20909109076 has 12 divisors (see below), whose sum is σ = 37281336372. Its totient is φ = 10257298688.

The previous prime is 20909109043. The next prime is 20909109079. The reversal of 20909109076 is 67090190902.

It can be written as a sum of positive squares in 2 ways, for example, as 14464872900 + 6444236176 = 120270^2 + 80276^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20909109079) 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, 49313725 + ... + 49314148.

It is an arithmetic number, because the mean of its divisors is an integer number (3106778031).

Almost surely, 2^20909109076 is an apocalyptic number.

It is an amenable number.

20909109076 is a deficient number, since it is larger than the sum of its proper divisors (16372227296).

20909109076 is a wasteful number, since it uses less digits than its factorization.

20909109076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98627930 (or 98627928 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 43.

Adding to 20909109076 its reverse (67090190902), we get a palindrome (87999299978).

The spelling of 20909109076 in words is "twenty billion, nine hundred nine million, one hundred nine thousand, seventy-six".