16551320 has 16 divisors (see below), whose sum is σ = 37240560. Its totient is φ = 6620512.

The previous prime is 16551287. The next prime is 16551341. The reversal of 16551320 is 2315561.

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 3 ways as a sum of consecutive naturals, for example, 206852 + ... + 206931.

It is an arithmetic number, because the mean of its divisors is an integer number (2327535).

Almost surely, 2^16551320 is an apocalyptic number.

16551320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16551320 is an abundant number, since it is smaller than the sum of its proper divisors (20689240).

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

16551320 is a wasteful number, since it uses less digits than its factorization.

16551320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413794 (or 413790 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 16551320 is about 4068.3313532700. The cubic root of 16551320 is about 254.8458378711.

Adding to 16551320 its reverse (2315561), we get a palindrome (18866881).

The spelling of 16551320 in words is "sixteen million, five hundred fifty-one thousand, three hundred twenty".