2051820020 has 12 divisors (see below), whose sum is σ = 4308822084. Its totient is φ = 820728000.

The previous prime is 2051819999. The next prime is 2051820037. The reversal of 2051820020 is 200281502.

It can be written as a sum of positive squares in 2 ways, for example, as 620408464 + 1431411556 = 24908^2 + 37834^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 102591001 = 2051820020 / (2 + 0 + 5 + 1 + 8 + 2 + 0 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 2051819974 and 2051820001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51295481 + ... + 51295520.

It is an arithmetic number, because the mean of its divisors is an integer number (359068507).

Almost surely, 2^2051820020 is an apocalyptic number.

2051820020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2051820020 is an abundant number, since it is smaller than the sum of its proper divisors (2257002064).

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

2051820020 is a wasteful number, since it uses less digits than its factorization.

2051820020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102591010 (or 102591008 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 2051820020 is about 45297.0199902819. The cubic root of 2051820020 is about 1270.7099219715.

The spelling of 2051820020 in words is "two billion, fifty-one million, eight hundred twenty thousand, twenty".