520720 has 40 divisors (see below), whose sum is σ = 1267776. Its totient is φ = 198528.

The previous prime is 520717. The next prime is 520721. The reversal of 520720 is 27025.

It is a happy number.

520720 is nontrivially palindromic in base 15.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×520720² = 542298636800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 520694 and 520703.

It is not an unprimeable number, because it can be changed into a prime (520721) 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, 1699 + ... + 1981.

2⁵²⁰⁷²⁰ 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 520720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (633888).

520720 is an abundant number, since it is smaller than the sum of its proper divisors (747056).

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

520720 is a wasteful number, since it uses less digits than its factorization.

520720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319 (or 313 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 16.

The square root of 520720 is about 721.6093125785. The cubic root of 520720 is about 80.4516124468.

Adding to 520720 its reverse (27025), we get a palindrome (547745).

The spelling of 520720 in words is "five hundred twenty thousand, seven hundred twenty".