520021340 has 48 divisors (see below), whose sum is σ = 1125344640. Its totient is φ = 201761280.

The previous prime is 520021331. The next prime is 520021343. The reversal of 520021340 is 43120025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520021343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86141 + ... + 91979.

It is an arithmetic number, because the mean of its divisors is an integer number (23444680).

Almost surely, 2^520021340 is an apocalyptic number.

It is an amenable number.

520021340 is an abundant number, since it is smaller than the sum of its proper divisors (605323300).

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

520021340 is a wasteful number, since it uses less digits than its factorization.

520021340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5982 (or 5980 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 520021340 is about 22803.9764076356. The cubic root of 520021340 is about 804.1561518606.

Adding to 520021340 its reverse (43120025), we get a palindrome (563141365).

The spelling of 520021340 in words is "five hundred twenty million, twenty-one thousand, three hundred forty".