2111200020 has 144 divisors (see below), whose sum is σ = 6602843520. Its totient is φ = 545626368.

The previous prime is 2111200019. The next prime is 2111200027. The reversal of 2111200020 is 200021112.

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 = 2111199975 and 2111200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111200027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2390499 + ... + 2391381.

It is an arithmetic number, because the mean of its divisors is an integer number (45853080).

Almost surely, 2^2111200020 is an apocalyptic number.

2111200020 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 2111200020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3301421760).

2111200020 is an abundant number, since it is smaller than the sum of its proper divisors (4491643500).

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

2111200020 is a wasteful number, since it uses less digits than its factorization.

2111200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294 (or 1289 counting only the distinct ones).

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

The square root of 2111200020 is about 45947.7966827573. The cubic root of 2111200020 is about 1282.8517189075.

Adding to 2111200020 its reverse (200021112), we get a palindrome (2311221132).

The spelling of 2111200020 in words is "two billion, one hundred eleven million, two hundred thousand, twenty".