8691818020 has 48 divisors (see below), whose sum is σ = 18632276208. Its totient is φ = 3404943360.

The previous prime is 8691817997. The next prime is 8691818063. The reversal of 8691818020 is 208181968.

It can be written as a sum of positive squares in 8 ways, for example, as 2836201536 + 5855616484 = 53256^2 + 76522^2 .

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, 268972 + ... + 299548.

It is an arithmetic number, because the mean of its divisors is an integer number (388172421).

Almost surely, 2^8691818020 is an apocalyptic number.

It is an amenable number.

8691818020 is an abundant number, since it is smaller than the sum of its proper divisors (9940458188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8691818020 is a wasteful number, since it uses less digits than its factorization.

8691818020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30880 (or 30878 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 43.

The square root of 8691818020 is about 93229.9201973272. The cubic root of 8691818020 is about 2056.0651645155.

Adding to 8691818020 its reverse (208181968), we get a palindrome (8899999988).

The spelling of 8691818020 in words is "eight billion, six hundred ninety-one million, eight hundred eighteen thousand, twenty".