2001820188 has 12 divisors (see below), whose sum is σ = 4670913800. Its totient is φ = 667273392.

The previous prime is 2001820181. The next prime is 2001820189. The reversal of 2001820188 is 8810281002.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001820181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83409163 + ... + 83409186.

Almost surely, 2^2001820188 is an apocalyptic number.

It is an amenable number.

2001820188 is an abundant number, since it is smaller than the sum of its proper divisors (2669093612).

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

2001820188 is a wasteful number, since it uses less digits than its factorization.

2001820188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166818356 (or 166818354 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 2001820188 is about 44741.7052424245. The cubic root of 2001820188 is about 1260.3031495321.

The spelling of 2001820188 in words is "two billion, one million, eight hundred twenty thousand, one hundred eighty-eight".