16217320 has 64 divisors (see below), whose sum is σ = 44167680. Its totient is φ = 5231616.

The previous prime is 16217297. The next prime is 16217329. The reversal of 16217320 is 2371261.

It is a junction number, because it is equal to n+sod(n) for n = 16217291 and 16217300.

It is not an unprimeable number, because it can be changed into a prime (16217329) 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, 3057 + ... + 6463.

It is an arithmetic number, because the mean of its divisors is an integer number (690120).

Almost surely, 2^16217320 is an apocalyptic number.

16217320 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 16217320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22083840).

16217320 is an abundant number, since it is smaller than the sum of its proper divisors (27950360).

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

16217320 is a wasteful number, since it uses less digits than its factorization.

16217320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3442 (or 3438 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 16217320 is about 4027.0733790186. The cubic root of 16217320 is about 253.1199418793.

Adding to 16217320 its reverse (2371261), we get a palindrome (18588581).

The spelling of 16217320 in words is "sixteen million, two hundred seventeen thousand, three hundred twenty".