20011021120020 has 96 divisors (see below), whose sum is σ = 64045057241088. Its totient is φ = 4573248423552.

The previous prime is 20011021120009. The next prime is 20011021120063. The reversal of 20011021120020 is 2002112011002.

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 = 20011021119978 and 20011021120005.

It is a congruent number.

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, 888972 + ... + 6388451.

It is an arithmetic number, because the mean of its divisors is an integer number (667136012928).

Almost surely, 2^{20011021120020} is an apocalyptic number.

20011021120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011021120020 is an abundant number, since it is smaller than the sum of its proper divisors (44034036121068).

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

20011021120020 is a wasteful number, since it uses less digits than its factorization.

20011021120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7283989 (or 7283987 counting only the distinct ones).

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

Adding to 20011021120020 its reverse (2002112011002), we get a palindrome (22013133131022).

The spelling of 20011021120020 in words is "twenty trillion, eleven billion, twenty-one million, one hundred twenty thousand, twenty".