2001331220 has 24 divisors (see below), whose sum is σ = 4803195264. Its totient is φ = 686170656.

The previous prime is 2001331207. The next prime is 2001331231. The reversal of 2001331220 is 221331002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 2001331195 and 2001331204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7147472 + ... + 7147751.

It is an arithmetic number, because the mean of its divisors is an integer number (200133136).

Almost surely, 2^2001331220 is an apocalyptic number.

2001331220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001331220 is an abundant number, since it is smaller than the sum of its proper divisors (2801864044).

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

2001331220 is a wasteful number, since it uses less digits than its factorization.

2001331220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14295239 (or 14295237 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 2001331220 is about 44736.2405662344. The cubic root of 2001331220 is about 1260.2005265799.

Adding to 2001331220 its reverse (221331002), we get a palindrome (2222662222).

The spelling of 2001331220 in words is "two billion, one million, three hundred thirty-one thousand, two hundred twenty".