2011220020 has 48 divisors (see below), whose sum is σ = 4545365328. Its totient is φ = 744744960.

The previous prime is 2011220011. The next prime is 2011220023. The reversal of 2011220020 is 200221102.

It can be written as a sum of positive squares in 8 ways, for example, as 528816016 + 1482404004 = 22996^2 + 38502^2 .

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 = 2011219979 and 2011220006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011220023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27747 + ... + 69226.

It is an arithmetic number, because the mean of its divisors is an integer number (94695111).

Almost surely, 2^2011220020 is an apocalyptic number.

2011220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2011220020 is an abundant number, since it is smaller than the sum of its proper divisors (2534145308).

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

2011220020 is a wasteful number, since it uses less digits than its factorization.

2011220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97060 (or 97058 counting only the distinct ones).

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

The square root of 2011220020 is about 44846.6277439007. The cubic root of 2011220020 is about 1262.2727143047.

Adding to 2011220020 its reverse (200221102), we get a palindrome (2211441122).

It can be divided in two parts, 201 and 1220020, that added together give a palindrome (1220221).

The spelling of 2011220020 in words is "two billion, eleven million, two hundred twenty thousand, twenty".