520020 has 72 divisors (see below), whose sum is σ = 1651104. Its totient is φ = 137376.

The previous prime is 520019. The next prime is 520021. The reversal of 520020 is 20025.

It is an interprime number because it is at equal distance from previous prime (520019) and next prime (520021).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 519984 and 520011.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 520020.

It is not an unprimeable number, because it can be changed into a prime (520021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4807 + ... + 4913.

It is an arithmetic number, because the mean of its divisors is an integer number (22932).

2⁵²⁰⁰²⁰ 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 520020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (825552).

520020 is an abundant number, since it is smaller than the sum of its proper divisors (1131084).

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

520020 is a wasteful number, since it uses less digits than its factorization.

520020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 9.

The square root of 520020 is about 721.1241224644. The cubic root of 520020 is about 80.4155461139.

Adding to 520020 its reverse (20025), we get a palindrome (540045).

The spelling of 520020 in words is "five hundred twenty thousand, twenty".