520685220 has 96 divisors (see below), whose sum is σ = 1595857536. Its totient is φ = 125798400.

The previous prime is 520685189. The next prime is 520685251. The reversal of 520685220 is 22586025.

It is an interprime number because it is at equal distance from previous prime (520685189) and next prime (520685251).

It is a super-2 number, since 2×520685220² = 542226196652896800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 221250 + ... + 223590.

It is an arithmetic number, because the mean of its divisors is an integer number (16623516).

Almost surely, 2^520685220 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 520685220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (797928768).

520685220 is an abundant number, since it is smaller than the sum of its proper divisors (1075172316).

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

520685220 is a wasteful number, since it uses less digits than its factorization.

520685220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2701 (or 2699 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 520685220 is about 22818.5279980984. The cubic root of 520685220 is about 804.4982122867.

The spelling of 520685220 in words is "five hundred twenty million, six hundred eighty-five thousand, two hundred twenty".