16443220 has 12 divisors (see below), whose sum is σ = 34530804. Its totient is φ = 6577280.

The previous prime is 16443209. The next prime is 16443247. The reversal of 16443220 is 2234461.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12306064 + 4137156 = 3508^2 + 2034^2 .

It is a super-3 number, since 3×16443220³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16443191 and 16443200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411061 + ... + 411100.

It is an arithmetic number, because the mean of its divisors is an integer number (2877567).

Almost surely, 2^16443220 is an apocalyptic number.

16443220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16443220 is an abundant number, since it is smaller than the sum of its proper divisors (18087584).

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

16443220 is a wasteful number, since it uses less digits than its factorization.

16443220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822170 (or 822168 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 16443220 is about 4055.0240443184. The cubic root of 16443220 is about 254.2898091212.

Adding to 16443220 its reverse (2234461), we get a palindrome (18677681).

The spelling of 16443220 in words is "sixteen million, four hundred forty-three thousand, two hundred twenty".