16553220 has 48 divisors (see below), whose sum is σ = 46569600. Its totient is φ = 4393216.

The previous prime is 16553209. The next prime is 16553231. The reversal of 16553220 is 2235561.

It is an interprime number because it is at equal distance from previous prime (16553209) and next prime (16553231).

It is a super-3 number, since 3×16553220³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15256 + ... + 16304.

It is an arithmetic number, because the mean of its divisors is an integer number (970200).

Almost surely, 2^16553220 is an apocalyptic number.

16553220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16553220 is an abundant number, since it is smaller than the sum of its proper divisors (30016380).

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

16553220 is a wasteful number, since it uses less digits than its factorization.

16553220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324 (or 1322 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 16553220 is about 4068.5648575388. The cubic root of 16553220 is about 254.8555891289.

Adding to 16553220 its reverse (2235561), we get a palindrome (18788781).

The spelling of 16553220 in words is "sixteen million, five hundred fifty-three thousand, two hundred twenty".