6520124020 has 12 divisors (see below), whose sum is σ = 13692260484. Its totient is φ = 2608049600.

The previous prime is 6520123997. The next prime is 6520124033. The reversal of 6520124020 is 204210256.

It can be written as a sum of positive squares in 2 ways, for example, as 4708429924 + 1811694096 = 68618^2 + 42564^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6520123982 and 6520124000.

It is a congruent number.

It is an unprimeable number.

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, 163003081 + ... + 163003120.

It is an arithmetic number, because the mean of its divisors is an integer number (1141021707).

Almost surely, 2^6520124020 is an apocalyptic number.

It is an amenable number.

6520124020 is an abundant number, since it is smaller than the sum of its proper divisors (7172136464).

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

6520124020 is a wasteful number, since it uses less digits than its factorization.

6520124020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326006210 (or 326006208 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 6520124020 is about 80747.2849079150. The cubic root of 6520124020 is about 1868.1795718804.

Adding to 6520124020 its reverse (204210256), we get a palindrome (6724334276).

The spelling of 6520124020 in words is "six billion, five hundred twenty million, one hundred twenty-four thousand, twenty".