2311144220 has 192 divisors, whose sum is σ = 6559128576. Its totient is φ = 661893120.

The previous prime is 2311144201. The next prime is 2311144261. The reversal of 2311144220 is 224411132.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2311144192 and 2311144201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1124714 + ... + 1126766.

It is an arithmetic number, because the mean of its divisors is an integer number (34162128).

Almost surely, 2^2311144220 is an apocalyptic number.

2311144220 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 2311144220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3279564288).

2311144220 is an abundant number, since it is smaller than the sum of its proper divisors (4247984356).

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

2311144220 is a wasteful number, since it uses less digits than its factorization.

2311144220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140 (or 2138 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 2311144220 is about 48074.3613582125. The cubic root of 2311144220 is about 1322.1346353435.

Adding to 2311144220 its reverse (224411132), we get a palindrome (2535555352).

The spelling of 2311144220 in words is "two billion, three hundred eleven million, one hundred forty-four thousand, two hundred twenty".