16457220 has 108 divisors (see below), whose sum is σ = 54155556. Its totient is φ = 4043520.

The previous prime is 16457209. The next prime is 16457263. The reversal of 16457220 is 2275461.

16457220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 3968064 + 12489156 = 1992^2 + 3534^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 30150 + ... + 30690.

Almost surely, 2^16457220 is an apocalyptic number.

16457220 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 16457220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27077778).

16457220 is an abundant number, since it is smaller than the sum of its proper divisors (37698336).

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

16457220 is a wasteful number, since it uses less digits than its factorization.

16457220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582 (or 564 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 16457220 is about 4056.7499306711. The cubic root of 16457220 is about 254.3619573469.

The spelling of 16457220 in words is "sixteen million, four hundred fifty-seven thousand, two hundred twenty".