16816220 has 48 divisors (see below), whose sum is σ = 37255680. Its totient is φ = 6363456.

The previous prime is 16816199. The next prime is 16816223. The reversal of 16816220 is 2261861.

It is a self number, because there is not a number n which added to its sum of digits gives 16816220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16816223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63809 + ... + 64071.

It is an arithmetic number, because the mean of its divisors is an integer number (776160).

Almost surely, 2^16816220 is an apocalyptic number.

16816220 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 16816220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18627840).

16816220 is an abundant number, since it is smaller than the sum of its proper divisors (20439460).

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

16816220 is a wasteful number, since it uses less digits than its factorization.

16816220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434 (or 432 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 16816220 is about 4100.7584664303. The cubic root of 16816220 is about 256.1982310650.

The spelling of 16816220 in words is "sixteen million, eight hundred sixteen thousand, two hundred twenty".