16889220 has 72 divisors (see below), whose sum is σ = 51793560. Its totient is φ = 4454400.

The previous prime is 16889189. The next prime is 16889221. The reversal of 16889220 is 2298861.

It can be written as a sum of positive squares in 4 ways, for example, as 1397124 + 15492096 = 1182^2 + 3936^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (16889221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17716 + ... + 18644.

It is an arithmetic number, because the mean of its divisors is an integer number (719355).

Almost surely, 2^16889220 is an apocalyptic number.

16889220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16889220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25896780).

16889220 is an abundant number, since it is smaller than the sum of its proper divisors (34904340).

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

16889220 is a wasteful number, since it uses less digits than its factorization.

16889220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045 (or 1040 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 16889220 is about 4109.6496201015. The cubic root of 16889220 is about 256.5684187603.

The spelling of 16889220 in words is "sixteen million, eight hundred eighty-nine thousand, two hundred twenty".