16611320 has 64 divisors (see below), whose sum is σ = 42940800. Its totient is φ = 5719680.

The previous prime is 16611311. The next prime is 16611341. The reversal of 16611320 is 2311661.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 16611292 and 16611301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7367 + ... + 9353.

It is an arithmetic number, because the mean of its divisors is an integer number (670950).

Almost surely, 2^16611320 is an apocalyptic number.

16611320 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 16611320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21470400).

16611320 is an abundant number, since it is smaller than the sum of its proper divisors (26329480).

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

16611320 is a wasteful number, since it uses less digits than its factorization.

16611320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2028 (or 2024 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 16611320 is about 4075.6987131043. The cubic root of 16611320 is about 255.1534127477.

Adding to 16611320 its reverse (2311661), we get a palindrome (18922981).

The spelling of 16611320 in words is "sixteen million, six hundred eleven thousand, three hundred twenty".