2051440220 has 24 divisors (see below), whose sum is σ = 4309144224. Its totient is φ = 820362816.

The previous prime is 2051440213. The next prime is 2051440229. The reversal of 2051440220 is 220441502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2051440192 and 2051440201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051440229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82262 + ... + 104258.

It is an arithmetic number, because the mean of its divisors is an integer number (179547676).

Almost surely, 2^2051440220 is an apocalyptic number.

2051440220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2051440220 is an abundant number, since it is smaller than the sum of its proper divisors (2257704004).

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

2051440220 is a wasteful number, since it uses less digits than its factorization.

2051440220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26669 (or 26667 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 2051440220 is about 45292.8274674920. The cubic root of 2051440220 is about 1270.6315126560.

Adding to 2051440220 its reverse (220441502), we get a palindrome (2271881722).

The spelling of 2051440220 in words is "two billion, fifty-one million, four hundred forty thousand, two hundred twenty".