16445220 has 48 divisors (see below), whose sum is σ = 50234688. Its totient is φ = 3986560.

The previous prime is 16445183. The next prime is 16445227. The reversal of 16445220 is 2254461.

It is not an unprimeable number, because it can be changed into a prime (16445227) 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, 11799 + ... + 13118.

It is an arithmetic number, because the mean of its divisors is an integer number (1046556).

Almost surely, 2^16445220 is an apocalyptic number.

16445220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16445220 is an abundant number, since it is smaller than the sum of its proper divisors (33789468).

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

16445220 is a wasteful number, since it uses less digits than its factorization.

16445220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24940 (or 24938 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 16445220 is about 4055.2706444823. The cubic root of 16445220 is about 254.3001185172.

Adding to 16445220 its reverse (2254461), we get a palindrome (18699681).

The spelling of 16445220 in words is "sixteen million, four hundred forty-five thousand, two hundred twenty".