2051820 has 36 divisors (see below), whose sum is σ = 6224400. Its totient is φ = 547104.

The previous prime is 2051801. The next prime is 2051821. The reversal of 2051820 is 281502.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a zygodrome in base 6.

It is a junction number, because it is equal to n+sod(n) for n = 2051793 and 2051802.

It is not an unprimeable number, because it can be changed into a prime (2051821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5520 + ... + 5879.

It is an arithmetic number, because the mean of its divisors is an integer number (172900).

2^2051820 is an apocalyptic number.

2051820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2051820 is an abundant number, since it is smaller than the sum of its proper divisors (4172580).

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

2051820 is a wasteful number, since it uses less digits than its factorization.

2051820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11414 (or 11409 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 2051820 is about 1432.4175368935. The cubic root of 2051820 is about 127.0709917843.

It can be divided in two parts, 205 and 1820, that added together give a square (2025 = 45²).

The spelling of 2051820 in words is "two million, fifty-one thousand, eight hundred twenty".