520236436 has 12 divisors (see below), whose sum is σ = 912579220. Its totient is φ = 259499520.

The previous prime is 520236419. The next prime is 520236439. The reversal of 520236436 is 634632025.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 217267600 + 302968836 = 14740^2 + 17406^2 .

It is a junction number, because it is equal to n+sod(n) for n = 520236398 and 520236407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520236439) 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 3 ways as a sum of consecutive naturals, for example, 152781 + ... + 156148.

Almost surely, 2^520236436 is an apocalyptic number.

It is an amenable number.

520236436 is a deficient number, since it is larger than the sum of its proper divisors (392342784).

520236436 is a wasteful number, since it uses less digits than its factorization.

520236436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309354 (or 309352 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 31.

The square root of 520236436 is about 22808.6921150688. The cubic root of 520236436 is about 804.2670107269.

The spelling of 520236436 in words is "five hundred twenty million, two hundred thirty-six thousand, four hundred thirty-six".