501840220 has 48 divisors (see below), whose sum is σ = 1256790528. Its totient is φ = 164577600.

The previous prime is 501840211. The next prime is 501840223. The reversal of 501840220 is 22048105.

It is a junction number, because it is equal to n+sod(n) for n = 501840191 and 501840200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501840223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74706 + ... + 81145.

It is an arithmetic number, because the mean of its divisors is an integer number (26183136).

Almost surely, 2^501840220 is an apocalyptic number.

It is an amenable number.

501840220 is an abundant number, since it is smaller than the sum of its proper divisors (754950308).

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

501840220 is a wasteful number, since it uses less digits than its factorization.

501840220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155890 (or 155888 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 501840220 is about 22401.7905534357. The cubic root of 501840220 is about 794.6730562330.

Adding to 501840220 its reverse (22048105), we get a palindrome (523888325).

The spelling of 501840220 in words is "five hundred one million, eight hundred forty thousand, two hundred twenty".