2001220220 has 48 divisors (see below), whose sum is σ = 4427623200. Its totient is φ = 757693440.

The previous prime is 2001220211. The next prime is 2001220261. The reversal of 2001220220 is 220221002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 792560 + ... + 795080.

It is an arithmetic number, because the mean of its divisors is an integer number (92242150).

Almost surely, 2^2001220220 is an apocalyptic number.

2001220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001220220 is an abundant number, since it is smaller than the sum of its proper divisors (2426402980).

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

2001220220 is a wasteful number, since it uses less digits than its factorization.

2001220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4638 (or 4636 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 2001220220 is about 44734.9999441153. Note that the first 4 decimals coincide. The cubic root of 2001220220 is about 1260.1772279469.

Adding to 2001220220 its reverse (220221002), we get a palindrome (2221441222).

The spelling of 2001220220 in words is "two billion, one million, two hundred twenty thousand, two hundred twenty".