500040020 has 12 divisors (see below), whose sum is σ = 1050084084. Its totient is φ = 200016000.

The previous prime is 500040019. The next prime is 500040061. The reversal of 500040020 is 20040005.

It can be written as a sum of positive squares in 2 ways, for example, as 361836484 + 138203536 = 19022^2 + 11756^2 .

It is a junction number, because it is equal to n+sod(n) for n = 500039983 and 500040010.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12500981 + ... + 12501020.

It is an arithmetic number, because the mean of its divisors is an integer number (87507007).

Almost surely, 2^500040020 is an apocalyptic number.

It is an amenable number.

500040020 is an abundant number, since it is smaller than the sum of its proper divisors (550044064).

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

500040020 is a wasteful number, since it uses less digits than its factorization.

500040020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25002010 (or 25002008 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 11.

The square root of 500040020 is about 22361.5746314968. The cubic root of 500040020 is about 793.7217013492.

Adding to 500040020 its reverse (20040005), we get a palindrome (520080025).

The spelling of 500040020 in words is "five hundred million, forty thousand, twenty".