16005720 has 64 divisors (see below), whose sum is σ = 48625920. Its totient is φ = 4214144.

The previous prime is 16005707. The next prime is 16005739. The reversal of 16005720 is 2750061.

16005720 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9157 + ... + 10763.

It is an arithmetic number, because the mean of its divisors is an integer number (759780).

Almost surely, 2^16005720 is an apocalyptic number.

16005720 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 16005720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24312960).

16005720 is an abundant number, since it is smaller than the sum of its proper divisors (32620200).

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

16005720 is a wasteful number, since it uses less digits than its factorization.

16005720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1704 (or 1700 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 16005720 is about 4000.7149361083. The cubic root of 16005720 is about 252.0142345197.

Adding to 16005720 its reverse (2750061), we get a palindrome (18755781).

The spelling of 16005720 in words is "sixteen million, five thousand, seven hundred twenty".