20211000020 has 24 divisors (see below), whose sum is σ = 43478299368. Its totient is φ = 7887219200.

The previous prime is 20210999999. The next prime is 20211000049. The reversal of 20211000020 is 2000011202.

It can be written as a sum of positive squares in 4 ways, for example, as 65739664 + 20145260356 = 8108^2 + 141934^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20210999971 and 20211000007.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 12322961 + ... + 12324600.

It is an arithmetic number, because the mean of its divisors is an integer number (1811595807).

Almost surely, 2^20211000020 is an apocalyptic number.

20211000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20211000020 is an abundant number, since it is smaller than the sum of its proper divisors (23267299348).

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

20211000020 is a wasteful number, since it uses less digits than its factorization.

20211000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24647611 (or 24647609 counting only the distinct ones).

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

Adding to 20211000020 its reverse (2000011202), we get a palindrome (22211011222).

The spelling of 20211000020 in words is "twenty billion, two hundred eleven million, twenty", and thus it is an aban number.