16943220 has 216 divisors, whose sum is σ = 63862344. Its totient is φ = 3612672.

The previous prime is 16943219. The next prime is 16943233. The reversal of 16943220 is 2234961.

It can be written as a sum of positive squares in 4 ways, for example, as 345744 + 16597476 = 588^2 + 4074^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 149884 + ... + 149996.

It is an arithmetic number, because the mean of its divisors is an integer number (295659).

Almost surely, 2^16943220 is an apocalyptic number.

16943220 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 16943220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31931172).

16943220 is an abundant number, since it is smaller than the sum of its proper divisors (46919124).

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

16943220 is a wasteful number, since it uses less digits than its factorization.

16943220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 16943220 is about 4116.2142801365. The cubic root of 16943220 is about 256.8415704095.

The spelling of 16943220 in words is "sixteen million, nine hundred forty-three thousand, two hundred twenty".