9911820020 has 24 divisors (see below), whose sum is σ = 20847020544. Its totient is φ = 3958594976.

The previous prime is 9911820011. The next prime is 9911820043. The reversal of 9911820020 is 200281199.

It is a happy number.

It is a super-2 number, since 2×9911820020² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 370052 + ... + 395931.

It is an arithmetic number, because the mean of its divisors is an integer number (868625856).

Almost surely, 2^9911820020 is an apocalyptic number.

It is an amenable number.

9911820020 is an abundant number, since it is smaller than the sum of its proper divisors (10935200524).

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

9911820020 is a wasteful number, since it uses less digits than its factorization.

9911820020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766639 (or 766637 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 9911820020 is about 99558.1238272397. The cubic root of 9911820020 is about 2148.0833844249.

The spelling of 9911820020 in words is "nine billion, nine hundred eleven million, eight hundred twenty thousand, twenty".