2001838381820 has 48 divisors (see below), whose sum is σ = 4215065238048. Its totient is φ = 798601731840.

The previous prime is 2001838381817. The next prime is 2001838381831. The reversal of 2001838381820 is 281838381002.

It is a super-2 number, since 2×2001838381820² (a number of 25 digits) contains 22 as substring.

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, 72168674 + ... + 72196406.

It is an arithmetic number, because the mean of its divisors is an integer number (87813859126).

Almost surely, 2^{2001838381820} is an apocalyptic number.

2001838381820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001838381820 is an abundant number, since it is smaller than the sum of its proper divisors (2213226856228).

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

2001838381820 is a wasteful number, since it uses less digits than its factorization.

2001838381820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37230 (or 37228 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 44.

The spelling of 2001838381820 in words is "two trillion, one billion, eight hundred thirty-eight million, three hundred eighty-one thousand, eight hundred twenty".