20111021200020 has 48 divisors (see below), whose sum is σ = 59623262854848. Its totient is φ = 5047471987200.

The previous prime is 20111021199989. The next prime is 20111021200031. The reversal of 20111021200020 is 2000212011102.

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 = 20111021199969 and 20111021200005.

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 15 ways as a sum of consecutive naturals, for example, 9858342706 + ... + 9858344745.

It is an arithmetic number, because the mean of its divisors is an integer number (1242151309476).

Almost surely, 2^{20111021200020} is an apocalyptic number.

20111021200020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111021200020 is an abundant number, since it is smaller than the sum of its proper divisors (39512241654828).

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

20111021200020 is a wasteful number, since it uses less digits than its factorization.

20111021200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19716687480 (or 19716687478 counting only the distinct ones).

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

Adding to 20111021200020 its reverse (2000212011102), we get a palindrome (22111233211122).

The spelling of 20111021200020 in words is "twenty trillion, one hundred eleven billion, twenty-one million, two hundred thousand, twenty".