520404025 has 6 divisors (see below), whose sum is σ = 645301022. Its totient is φ = 416323200.

The previous prime is 520403971. The next prime is 520404029.

520404025 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 3 ways, for example, as 16670889 + 503733136 = 4083^2 + 22444^2 .

It is a de Polignac number, because none of the positive numbers 2^k-520404025 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 520403987 and 520404005.

It is not an unprimeable number, because it can be changed into a prime (520404029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10408056 + ... + 10408105.

Almost surely, 2^520404025 is an apocalyptic number.

It is an amenable number.

520404025 is a deficient number, since it is larger than the sum of its proper divisors (124896997).

520404025 is a wasteful number, since it uses less digits than its factorization.

520404025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20816171 (or 20816166 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 520404025 is about 22812.3656160425. The cubic root of 520404025 is about 804.3533636644.

It can be divided in two parts, 52040 and 4025, that added together give a palindrome (56065).

The spelling of 520404025 in words is "five hundred twenty million, four hundred four thousand, twenty-five".