16820215808 has 168 divisors, whose sum is σ = 37652065920. Its totient is φ = 7506329600.

The previous prime is 16820215801. The next prime is 16820215829. The reversal of 16820215808 is 80851202861.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (16820215801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70377353 + ... + 70377591.

It is an arithmetic number, because the mean of its divisors is an integer number (224119440).

Almost surely, 2^16820215808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16820215808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18826032960).

16820215808 is an abundant number, since it is smaller than the sum of its proper divisors (20831850112).

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

16820215808 is an equidigital number, since it uses as much as digits as its factorization.

16820215808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 41.

The spelling of 16820215808 in words is "sixteen billion, eight hundred twenty million, two hundred fifteen thousand, eight hundred eight".