20121020110020 has 48 divisors (see below), whose sum is σ = 56355559767360. Its totient is φ = 5364014557056.

The previous prime is 20121020110007. The next prime is 20121020110073. The reversal of 20121020110020 is 2001102012102.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20121020109978 and 20121020110005.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49508610 + ... + 49913369.

It is an arithmetic number, because the mean of its divisors is an integer number (1174074161820).

Almost surely, 2^{20121020110020} is an apocalyptic number.

20121020110020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121020110020 is an abundant number, since it is smaller than the sum of its proper divisors (36234539657340).

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

20121020110020 is a wasteful number, since it uses less digits than its factorization.

20121020110020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99425364 (or 99425362 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20121020110020 its reverse (2001102012102), we get a palindrome (22122122122122).

The spelling of 20121020110020 in words is "twenty trillion, one hundred twenty-one billion, twenty million, one hundred ten thousand, twenty".