521246020 has 12 divisors (see below), whose sum is σ = 1094616684. Its totient is φ = 208498400.

The previous prime is 521245999. The next prime is 521246039. The reversal of 521246020 is 20642125.

It can be written as a sum of positive squares in 2 ways, for example, as 395850816 + 125395204 = 19896^2 + 11198^2 .

It is a junction number, because it is equal to n+sod(n) for n = 521245982 and 521246000.

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, 13031131 + ... + 13031170.

It is an arithmetic number, because the mean of its divisors is an integer number (91218057).

Almost surely, 2^521246020 is an apocalyptic number.

It is an amenable number.

521246020 is an abundant number, since it is smaller than the sum of its proper divisors (573370664).

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

521246020 is a wasteful number, since it uses less digits than its factorization.

521246020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26062310 (or 26062308 counting only the distinct ones).

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

The square root of 521246020 is about 22830.8129509223. The cubic root of 521246020 is about 804.7869348541.

Adding to 521246020 its reverse (20642125), we get a palindrome (541888145).

The spelling of 521246020 in words is "five hundred twenty-one million, two hundred forty-six thousand, twenty".