511220520 has 48 divisors (see below), whose sum is σ = 1661467860. Its totient is φ = 136325376.

The previous prime is 511220503. The next prime is 511220531. The reversal of 511220520 is 25022115.

It can be written as a sum of positive squares in 2 ways, for example, as 509766084 + 1454436 = 22578^2 + 1206^2 .

It is a super-2 number, since 2×511220520² = 522692840138140800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 511220493 and 511220502.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 709669 + ... + 710388.

Almost surely, 2^511220520 is an apocalyptic number.

It is an amenable number.

511220520 is an abundant number, since it is smaller than the sum of its proper divisors (1150247340).

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

511220520 is a wasteful number, since it uses less digits than its factorization.

511220520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420074 (or 1420067 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 511220520 is about 22610.1862000294. The cubic root of 511220520 is about 799.5938146350.

Adding to 511220520 its reverse (25022115), we get a palindrome (536242635).

The spelling of 511220520 in words is "five hundred eleven million, two hundred twenty thousand, five hundred twenty".