520021164 has 24 divisors (see below), whose sum is σ = 1306720240. Its totient is φ = 160006464.

The previous prime is 520021093. The next prime is 520021189. The reversal of 520021164 is 461120025.

It is a super-2 number, since 2×520021164² = 540844022015829792, which contains 22 as substring.

520021164 is a modest number, since divided by 21164 gives 520 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 520021164.

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 7 ways as a sum of consecutive naturals, for example, 1666579 + ... + 1666890.

Almost surely, 2^520021164 is an apocalyptic number.

It is an amenable number.

520021164 is an abundant number, since it is smaller than the sum of its proper divisors (786699076).

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

520021164 is a wasteful number, since it uses less digits than its factorization.

520021164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3333489 (or 3333487 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 520021164 is about 22803.9725486591. The cubic root of 520021164 is about 804.1560611390.

Adding to 520021164 its reverse (461120025), we get a palindrome (981141189).

The spelling of 520021164 in words is "five hundred twenty million, twenty-one thousand, one hundred sixty-four".