531045020 has 48 divisors (see below), whose sum is σ = 1222851168. Its totient is φ = 192111360.

The previous prime is 531045019. The next prime is 531045023. The reversal of 531045020 is 20540135.

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 = 531044983 and 531045001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531045023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37214 + ... + 49466.

It is an arithmetic number, because the mean of its divisors is an integer number (25476066).

Almost surely, 2^531045020 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 531045020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (611425584).

531045020 is an abundant number, since it is smaller than the sum of its proper divisors (691806148).

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

531045020 is a wasteful number, since it uses less digits than its factorization.

531045020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12470 (or 12468 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 531045020 is about 23044.4140736969. The cubic root of 531045020 is about 809.7987713307.

Adding to 531045020 its reverse (20540135), we get a palindrome (551585155).

The spelling of 531045020 in words is "five hundred thirty-one million, forty-five thousand, twenty".