520020531 has 18 divisors (see below), whose sum is σ = 797928612. Its totient is φ = 326285760.

The previous prime is 520020521. The next prime is 520020569. The reversal of 520020531 is 135020025.

It is a happy number.

It is not a de Polignac number, because 520020531 - 2⁹ = 520020019 is a prime.

It is a super-2 number, since 2×520020531² = 540842705323043922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (520020521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 97365 + ... + 102566.

Almost surely, 2^520020531 is an apocalyptic number.

520020531 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

520020531 is a deficient number, since it is larger than the sum of its proper divisors (277908081).

520020531 is a wasteful number, since it uses less digits than its factorization.

520020531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199971 (or 199951 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 520020531 is about 22803.9586694942. The cubic root of 520020531 is about 804.1557348504.

Adding to 520020531 its reverse (135020025), we get a palindrome (655040556).

The spelling of 520020531 in words is "five hundred twenty million, twenty thousand, five hundred thirty-one".