550321220 has 24 divisors (see below), whose sum is σ = 1156193304. Its totient is φ = 220029696.

The previous prime is 550321217. The next prime is 550321237. The reversal of 550321220 is 22123055.

It can be written as a sum of positive squares in 4 ways, for example, as 281098756 + 269222464 = 16766^2 + 16408^2 .

It is a super-6 number, since 6×550321220⁶ (a number of 54 digits) contains 666666 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 = 550321192 and 550321201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53624 + ... + 63056.

It is an arithmetic number, because the mean of its divisors is an integer number (48174721).

Almost surely, 2^550321220 is an apocalyptic number.

It is an amenable number.

550321220 is an abundant number, since it is smaller than the sum of its proper divisors (605872084).

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

550321220 is a wasteful number, since it uses less digits than its factorization.

550321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12359 (or 12357 counting only the distinct ones).

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

The square root of 550321220 is about 23458.9262328863. The cubic root of 550321220 is about 819.4807440304.

Adding to 550321220 its reverse (22123055), we get a palindrome (572444275).

The spelling of 550321220 in words is "five hundred fifty million, three hundred twenty-one thousand, two hundred twenty".