20111200001020 has 48 divisors (see below), whose sum is σ = 44457764883840. Its totient is φ = 7620841509696.

The previous prime is 20111200000979. The next prime is 20111200001027. The reversal of 20111200001020 is 2010000211102.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20111200000988 and 20111200001006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111200001027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11220579 + ... + 12888901.

It is an arithmetic number, because the mean of its divisors is an integer number (926203435080).

Almost surely, 2^{20111200001020} is an apocalyptic number.

20111200001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111200001020 is an abundant number, since it is smaller than the sum of its proper divisors (24346564882820).

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

20111200001020 is a wasteful number, since it uses less digits than its factorization.

20111200001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1700074 (or 1700072 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20111200001020 its reverse (2010000211102), we get a palindrome (22121200212122).

The spelling of 20111200001020 in words is "twenty trillion, one hundred eleven billion, two hundred million, one thousand, twenty".