16209220 has 24 divisors (see below), whose sum is σ = 34473600. Its totient is φ = 6400992.

The previous prime is 16209203. The next prime is 16209239. The reversal of 16209220 is 2290261.

It is a happy number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 16209191 and 16209200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3550 + ... + 6709.

It is an arithmetic number, because the mean of its divisors is an integer number (1436400).

Almost surely, 2^16209220 is an apocalyptic number.

16209220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16209220 is an abundant number, since it is smaller than the sum of its proper divisors (18264380).

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

16209220 is a wasteful number, since it uses less digits than its factorization.

16209220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10347 (or 10345 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 16209220 is about 4026.0675602876. The cubic root of 16209220 is about 253.0777932594.

Adding to 16209220 its reverse (2290261), we get a palindrome (18499481).

The spelling of 16209220 in words is "sixteen million, two hundred nine thousand, two hundred twenty".