6991120020 has 48 divisors (see below), whose sum is σ = 20426232960. Its totient is φ = 1783241856.

The previous prime is 6991120013. The next prime is 6991120021. The reversal of 6991120020 is 200211996.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a self number, because there is not a number n which added to its sum of digits gives 6991120020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6991120021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2531635 + ... + 2534394.

It is an arithmetic number, because the mean of its divisors is an integer number (425546520).

Almost surely, 2^6991120020 is an apocalyptic number.

6991120020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6991120020 is an abundant number, since it is smaller than the sum of its proper divisors (13435112940).

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

6991120020 is a wasteful number, since it uses less digits than its factorization.

6991120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5066064 (or 5066062 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 6991120020 is about 83612.9177818834. The cubic root of 6991120020 is about 1912.1219456924.

The spelling of 6991120020 in words is "six billion, nine hundred ninety-one million, one hundred twenty thousand, twenty".