2001999980 has 48 divisors (see below), whose sum is σ = 4429404000. Its totient is φ = 757979136.

The previous prime is 2001999953. The next prime is 2001999997. The reversal of 2001999980 is 899991002.

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, 716426 + ... + 719214.

It is an arithmetic number, because the mean of its divisors is an integer number (92279250).

Almost surely, 2^2001999980 is an apocalyptic number.

2001999980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001999980 is an abundant number, since it is smaller than the sum of its proper divisors (2427404020).

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

2001999980 is a wasteful number, since it uses less digits than its factorization.

2001999980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4706 (or 4704 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 2001999980 is about 44743.7144188991. The cubic root of 2001999980 is about 1260.3408794677.

The spelling of 2001999980 in words is "two billion, one million, nine hundred ninety-nine thousand, nine hundred eighty".