520023564 has 60 divisors (see below), whose sum is σ = 1368237024. Its totient is φ = 172220256.

The previous prime is 520023547. The next prime is 520023571. The reversal of 520023564 is 465320025.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 19 ways as a sum of consecutive naturals, for example, 45757 + ... + 55979.

Almost surely, 2^520023564 is an apocalyptic number.

520023564 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520023564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (684118512).

520023564 is an abundant number, since it is smaller than the sum of its proper divisors (848213460).

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

520023564 is a wasteful number, since it uses less digits than its factorization.

520023564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10396 (or 10385 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 520023564 is about 22804.0251710087. The cubic root of 520023564 is about 804.1572982500.

Adding to 520023564 its reverse (465320025), we get a palindrome (985343589).

The spelling of 520023564 in words is "five hundred twenty million, twenty-three thousand, five hundred sixty-four".