9811399020 has 96 divisors (see below), whose sum is σ = 27761130432. Its totient is φ = 2588909568.

The previous prime is 9811398983. The next prime is 9811399051. The reversal of 9811399020 is 209931189.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8087934 + ... + 8089146.

It is an arithmetic number, because the mean of its divisors is an integer number (289178442).

Almost surely, 2^9811399020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9811399020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13880565216).

9811399020 is an abundant number, since it is smaller than the sum of its proper divisors (17949731412).

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

9811399020 is a wasteful number, since it uses less digits than its factorization.

9811399020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2531 (or 2529 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 9811399020 is about 99052.5063791926. The cubic root of 9811399020 is about 2140.8043545163.

The spelling of 9811399020 in words is "nine billion, eight hundred eleven million, three hundred ninety-nine thousand, twenty".