520521716220 has 96 divisors (see below), whose sum is σ = 1606348751616. Its totient is φ = 124886169600.

The previous prime is 520521716207. The next prime is 520521716293. The reversal of 520521716220 is 22617125025.

It is a super-2 number, since 2×520521716220² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 4001286 + ... + 4129325.

It is an arithmetic number, because the mean of its divisors is an integer number (16732799496).

Almost surely, 2^520521716220 is an apocalyptic number.

It is an amenable number.

520521716220 is an abundant number, since it is smaller than the sum of its proper divisors (1085827035396).

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

520521716220 is a wasteful number, since it uses less digits than its factorization.

520521716220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8130731 (or 8130729 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The spelling of 520521716220 in words is "five hundred twenty billion, five hundred twenty-one million, seven hundred sixteen thousand, two hundred twenty".