165303220 has 12 divisors (see below), whose sum is σ = 347136804. Its totient is φ = 66121280.

The previous prime is 165303217. The next prime is 165303221. The reversal of 165303220 is 22303561.

It can be written as a sum of positive squares in 2 ways, for example, as 81324324 + 83978896 = 9018^2 + 9164^2 .

It is a junction number, because it is equal to n+sod(n) for n = 165303191 and 165303200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165303221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4132561 + ... + 4132600.

It is an arithmetic number, because the mean of its divisors is an integer number (28928067).

Almost surely, 2^165303220 is an apocalyptic number.

165303220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165303220 is an abundant number, since it is smaller than the sum of its proper divisors (181833584).

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

165303220 is a wasteful number, since it uses less digits than its factorization.

165303220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8265170 (or 8265168 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 165303220 is about 12857.0299836315. The cubic root of 165303220 is about 548.8164300558.

Adding to 165303220 its reverse (22303561), we get a palindrome (187606781).

The spelling of 165303220 in words is "one hundred sixty-five million, three hundred three thousand, two hundred twenty".