520302420 has 144 divisors (see below), whose sum is σ = 1779476160. Its totient is φ = 126118080.

The previous prime is 520302407. The next prime is 520302421. The reversal of 520302420 is 24203025.

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 = 520302393 and 520302402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520302421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61359 + ... + 69321.

Almost surely, 2^520302420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520302420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (889738080).

520302420 is an abundant number, since it is smaller than the sum of its proper divisors (1259173740).

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

520302420 is a wasteful number, since it uses less digits than its factorization.

520302420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8003 (or 7984 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 520302420 is about 22810.1385353092. The cubic root of 520302420 is about 804.3010122611.

Adding to 520302420 its reverse (24203025), we get a palindrome (544505445).

The spelling of 520302420 in words is "five hundred twenty million, three hundred two thousand, four hundred twenty".