202111000020 has 72 divisors (see below), whose sum is σ = 629639514504. Its totient is φ = 52439609088.

The previous prime is 202110999997. The next prime is 202111000051. The reversal of 202111000020 is 20000111202.

202111000020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 77901275664 + 124209724356 = 279108^2 + 352434^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 202110999966 and 202111000011.

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 23 ways as a sum of consecutive naturals, for example, 15166839 + ... + 15180158.

It is an arithmetic number, because the mean of its divisors is an integer number (8744993257).

Almost surely, 2^202111000020 is an apocalyptic number.

202111000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202111000020 is an abundant number, since it is smaller than the sum of its proper divisors (427528514484).

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

202111000020 is a wasteful number, since it uses less digits than its factorization.

202111000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30347049 (or 30347044 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 202111000020 its reverse (20000111202), we get a palindrome (222111111222).

The spelling of 202111000020 in words is "two hundred two billion, one hundred eleven million, twenty", and thus it is an aban number.