16820325738 has 96 divisors (see below), whose sum is σ = 39332367360. Its totient is φ = 5177844000.

The previous prime is 16820325721. The next prime is 16820325749. The reversal of 16820325738 is 83752302861.

16820325738 is a `hidden beast` number, since 168 + 203 + 257 + 38 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16820325693 and 16820325702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11043445 + ... + 11044967.

It is an arithmetic number, because the mean of its divisors is an integer number (409712160).

Almost surely, 2^16820325738 is an apocalyptic number.

16820325738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16820325738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19666183680).

16820325738 is an abundant number, since it is smaller than the sum of its proper divisors (22512041622).

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

16820325738 is a wasteful number, since it uses less digits than its factorization.

16820325738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344 (or 2341 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 16820325738 in words is "sixteen billion, eight hundred twenty million, three hundred twenty-five thousand, seven hundred thirty-eight".