211020020020 has 96 divisors (see below), whose sum is σ = 467697807360. Its totient is φ = 79856824320.

The previous prime is 211020019999. The next prime is 211020020021. The reversal of 211020020020 is 20020020112.

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 = 211020019979 and 211020020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211020020021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29398672 + ... + 29405848.

It is an arithmetic number, because the mean of its divisors is an integer number (4871852160).

Almost surely, 2^211020020020 is an apocalyptic number.

211020020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211020020020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233848903680).

211020020020 is an abundant number, since it is smaller than the sum of its proper divisors (256677787340).

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

211020020020 is a wasteful number, since it uses less digits than its factorization.

211020020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8273 (or 8271 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 211020020020 its reverse (20020020112), we get a palindrome (231040040132).

The spelling of 211020020020 in words is "two hundred eleven billion, twenty million, twenty thousand, twenty".