531302420 has 48 divisors (see below), whose sum is σ = 1229268096. Its totient is φ = 191280000.

The previous prime is 531302407. The next prime is 531302423. The reversal of 531302420 is 24203135.

It is a happy number.

It is a super-2 number, since 2×531302420² = 564564522995712800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 531302392 and 531302401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531302423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10265 + ... + 34175.

It is an arithmetic number, because the mean of its divisors is an integer number (25609752).

Almost surely, 2^531302420 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 531302420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (614634048).

531302420 is an abundant number, since it is smaller than the sum of its proper divisors (697965676).

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

531302420 is a wasteful number, since it uses less digits than its factorization.

531302420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24032 (or 24030 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 531302420 is about 23049.9982646420. The cubic root of 531302420 is about 809.9295879453.

Adding to 531302420 its reverse (24203135), we get a palindrome (555505555).

The spelling of 531302420 in words is "five hundred thirty-one million, three hundred two thousand, four hundred twenty".