550420 has 48 divisors (see below), whose sum is σ = 1305360. Its totient is φ = 193536.

The previous prime is 550379. The next prime is 550427. The reversal of 550420 is 24055.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 26244 + 524176 = 162^2 + 724^2 .

It is a zygodrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 550394 and 550403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550427) by changing a digit.

550420 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7504 + ... + 7576.

It is an arithmetic number, because the mean of its divisors is an integer number (27195).

2⁵⁵⁰⁴²⁰ 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 550420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (652680).

550420 is an abundant number, since it is smaller than the sum of its proper divisors (754940).

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

550420 is a wasteful number, since it uses less digits than its factorization.

550420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 550420 is about 741.9029586139. The cubic root of 550420 is about 81.9529772042.

Adding to 550420 its reverse (24055), we get a palindrome (574475).

The spelling of 550420 in words is "five hundred fifty thousand, four hundred twenty".