16553320 has 32 divisors (see below), whose sum is σ = 42566400. Its totient is φ = 5675328.

The previous prime is 16553309. The next prime is 16553333. The reversal of 16553320 is 2335561.

It is a happy 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, 29280 + ... + 29839.

It is an arithmetic number, because the mean of its divisors is an integer number (1330200).

Almost surely, 2^16553320 is an apocalyptic number.

16553320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16553320 is an abundant number, since it is smaller than the sum of its proper divisors (26013080).

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

16553320 is a wasteful number, since it uses less digits than its factorization.

16553320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59137 (or 59133 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 16553320 is about 4068.5771468660. The cubic root of 16553320 is about 254.8561023323.

Adding to 16553320 its reverse (2335561), we get a palindrome (18888881).

The spelling of 16553320 in words is "sixteen million, five hundred fifty-three thousand, three hundred twenty".