16420266 has 64 divisors (see below), whose sum is σ = 39951360. Its totient is φ = 4976640.

The previous prime is 16420259. The next prime is 16420279. The reversal of 16420266 is 66202461.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28170 + ... + 28746.

It is an arithmetic number, because the mean of its divisors is an integer number (624240).

Almost surely, 2^16420266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16420266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19975680).

16420266 is an abundant number, since it is smaller than the sum of its proper divisors (23531094).

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

16420266 is a wasteful number, since it uses less digits than its factorization.

16420266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 16420266 is about 4052.1927397398. The cubic root of 16420266 is about 254.1714282843.

The spelling of 16420266 in words is "sixteen million, four hundred twenty thousand, two hundred sixty-six".