16209920 has 48 divisors (see below), whose sum is σ = 38918880. Its totient is φ = 6479872.

The previous prime is 16209911. The next prime is 16209923. The reversal of 16209920 is 2990261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16209923) 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, 9449 + ... + 11031.

It is an arithmetic number, because the mean of its divisors is an integer number (810810).

Almost surely, 2^16209920 is an apocalyptic number.

16209920 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 16209920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19459440).

16209920 is an abundant number, since it is smaller than the sum of its proper divisors (22708960).

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

16209920 is an equidigital number, since it uses as much as digits as its factorization.

16209920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610 (or 1590 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 16209920 is about 4026.1544928132. The cubic root of 16209920 is about 253.0814362869.

The spelling of 16209920 in words is "sixteen million, two hundred nine thousand, nine hundred twenty".