16005820 has 12 divisors (see below), whose sum is σ = 33612264. Its totient is φ = 6402320.

The previous prime is 16005811. The next prime is 16005839. The reversal of 16005820 is 2850061.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 16005791 and 16005800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400126 + ... + 400165.

It is an arithmetic number, because the mean of its divisors is an integer number (2801022).

Almost surely, 2^16005820 is an apocalyptic number.

16005820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16005820 is an abundant number, since it is smaller than the sum of its proper divisors (17606444).

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

16005820 is a wasteful number, since it uses less digits than its factorization.

16005820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800300 (or 800298 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 16005820 is about 4000.7274338550. The cubic root of 16005820 is about 252.0147593606.

Adding to 16005820 its reverse (2850061), we get a palindrome (18855881).

The spelling of 16005820 in words is "sixteen million, five thousand, eight hundred twenty".