16226720 has 48 divisors (see below), whose sum is σ = 39386088. Its totient is φ = 6312960.

The previous prime is 16226713. The next prime is 16226729. The reversal of 16226720 is 2762261.

It can be written as a sum of positive squares in 4 ways, for example, as 14409616 + 1817104 = 3796^2 + 1348^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16226720.

It is not an unprimeable number, because it can be changed into a prime (16226729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4550 + ... + 7290.

Almost surely, 2^16226720 is an apocalyptic number.

16226720 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 16226720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19693044).

16226720 is an abundant number, since it is smaller than the sum of its proper divisors (23159368).

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

16226720 is a wasteful number, since it uses less digits than its factorization.

16226720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2793 (or 2785 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 16226720 is about 4028.2403106071. The cubic root of 16226720 is about 253.1688375023.

Adding to 16226720 its reverse (2762261), we get a palindrome (18988981).

The spelling of 16226720 in words is "sixteen million, two hundred twenty-six thousand, seven hundred twenty".