16218920 has 16 divisors (see below), whose sum is σ = 36492660. Its totient is φ = 6487552.

The previous prime is 16218919. The next prime is 16218929. The reversal of 16218920 is 2981261.

It can be written as a sum of positive squares in 2 ways, for example, as 16176484 + 42436 = 4022^2 + 206^2 .

It is not an unprimeable number, because it can be changed into a prime (16218929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202697 + ... + 202776.

Almost surely, 2^16218920 is an apocalyptic number.

16218920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16218920 is an abundant number, since it is smaller than the sum of its proper divisors (20273740).

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

16218920 is a wasteful number, since it uses less digits than its factorization.

16218920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405484 (or 405480 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 16218920 is about 4027.2720295505. The cubic root of 16218920 is about 253.1282658726.

The spelling of 16218920 in words is "sixteen million, two hundred eighteen thousand, nine hundred twenty".