2001122320 has 40 divisors (see below), whose sum is σ = 4654998936. Its totient is φ = 800037888.

The previous prime is 2001122303. The next prime is 2001122327. The reversal of 2001122320 is 232211002.

It can be written as a sum of positive squares in 4 ways, for example, as 204718864 + 1796403456 = 14308^2 + 42384^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 2001122320.

It is not an unprimeable number, because it can be changed into a prime (2001122327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186214 + ... + 196666.

Almost surely, 2^2001122320 is an apocalyptic number.

2001122320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001122320 is an abundant number, since it is smaller than the sum of its proper divisors (2653876616).

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

2001122320 is a wasteful number, since it uses less digits than its factorization.

2001122320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12859 (or 12853 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 2001122320 is about 44733.9057092045. The cubic root of 2001122320 is about 1260.1566782574.

Adding to 2001122320 its reverse (232211002), we get a palindrome (2233333322).

The spelling of 2001122320 in words is "two billion, one million, one hundred twenty-two thousand, three hundred twenty".