501531020 has 96 divisors (see below), whose sum is σ = 1124928000. Its totient is φ = 187545600.

The previous prime is 501531013. The next prime is 501531053. The reversal of 501531020 is 20135105.

It is a self number, because there is not a number n which added to its sum of digits gives 501531020.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3365906 + ... + 3366054.

It is an arithmetic number, because the mean of its divisors is an integer number (11718000).

Almost surely, 2^501531020 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 501531020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (562464000).

501531020 is an abundant number, since it is smaller than the sum of its proper divisors (623396980).

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

501531020 is a wasteful number, since it uses less digits than its factorization.

501531020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 337 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 501531020 is about 22394.8882560284. Note that the first 3 decimals coincide. The cubic root of 501531020 is about 794.5098147733.

Adding to 501531020 its reverse (20135105), we get a palindrome (521666125).

The spelling of 501531020 in words is "five hundred one million, five hundred thirty-one thousand, twenty".