520555220 has 96 divisors (see below), whose sum is σ = 1176698880. Its totient is φ = 193052160.

The previous prime is 520555213. The next prime is 520555223. The reversal of 520555220 is 22555025.

It is a self number, because there is not a number n which added to its sum of digits gives 520555220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520555223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2725325 + ... + 2725515.

It is an arithmetic number, because the mean of its divisors is an integer number (12257280).

Almost surely, 2^520555220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520555220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (588349440).

520555220 is an abundant number, since it is smaller than the sum of its proper divisors (656143660).

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

520555220 is a wasteful number, since it uses less digits than its factorization.

520555220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 391 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 26.

The square root of 520555220 is about 22815.6792579138. The cubic root of 520555220 is about 804.4312534226.

It can be divided in two parts, 52055 and 5220, that added together give a palindrome (57275).

The spelling of 520555220 in words is "five hundred twenty million, five hundred fifty-five thousand, two hundred twenty".