16009820 has 24 divisors (see below), whose sum is σ = 33871824. Its totient is φ = 6356096.

The previous prime is 16009781. The next prime is 16009823. The reversal of 16009820 is 2890061.

16009820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 16009820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16009823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182 + ... + 5661.

It is an arithmetic number, because the mean of its divisors is an integer number (1411326).

Almost surely, 2^16009820 is an apocalyptic number.

16009820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16009820 is an abundant number, since it is smaller than the sum of its proper divisors (17862004).

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

16009820 is a wasteful number, since it uses less digits than its factorization.

16009820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5989 (or 5987 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 16009820 is about 4001.2273117132. The cubic root of 16009820 is about 252.0357512056.

Adding to 16009820 its reverse (2890061), we get a palindrome (18899881).

The spelling of 16009820 in words is "sixteen million, nine thousand, eight hundred twenty".