520820 has 12 divisors (see below), whose sum is σ = 1093764. Its totient is φ = 208320.

The previous prime is 520813. The next prime is 520837. The reversal of 520820 is 28025.

It is a happy number.

520820 is nontrivially palindromic in base 9.

It can be written as a sum of positive squares in 2 ways, for example, as 357604 + 163216 = 598^2 + 404^2 .

It is a congruent number.

It is an unprimeable number.

520820 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13001 + ... + 13040.

It is an arithmetic number, because the mean of its divisors is an integer number (91147).

2⁵²⁰⁸²⁰ is an apocalyptic number.

It is an amenable number.

520820 is an abundant number, since it is smaller than the sum of its proper divisors (572944).

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

520820 is a wasteful number, since it uses less digits than its factorization.

520820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26050 (or 26048 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 520820 is about 721.6785988236. The cubic root of 520820 is about 80.4567621410.

Adding to 520820 its reverse (28025), we get a palindrome (548845).

The spelling of 520820 in words is "five hundred twenty thousand, eight hundred twenty".