520020724 has 6 divisors (see below), whose sum is σ = 910036274. Its totient is φ = 260010360.

The previous prime is 520020719. The next prime is 520020733. The reversal of 520020724 is 427020025.

It can be written as a sum of positive squares in only one way, i.e., 515744100 + 4276624 = 22710^2 + 2068^2 .

It is a junction number, because it is equal to n+sod(n) for n = 520020695 and 520020704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65002587 + ... + 65002594.

Almost surely, 2^520020724 is an apocalyptic number.

It is an amenable number.

520020724 is a deficient number, since it is larger than the sum of its proper divisors (390015550).

520020724 is a wasteful number, since it uses less digits than its factorization.

520020724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130005185 (or 130005183 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 520020724 is about 22803.9629012152. The cubic root of 520020724 is about 804.1558343350.

Adding to 520020724 its reverse (427020025), we get a palindrome (947040749).

The spelling of 520020724 in words is "five hundred twenty million, twenty thousand, seven hundred twenty-four".