16820731564 has 108 divisors (see below), whose sum is σ = 38277263808. Its totient is φ = 6439305600.

The previous prime is 16820731531. The next prime is 16820731607. The reversal of 16820731564 is 46513702861.

It is a self number, because there is not a number n which added to its sum of digits gives 16820731564.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1018654 + ... + 1035034.

Almost surely, 2^16820731564 is an apocalyptic number.

16820731564 is a gapful number since it is divisible by the number (14) 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 16820731564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19138631904).

16820731564 is an abundant number, since it is smaller than the sum of its proper divisors (21456532244).

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

16820731564 is a wasteful number, since it uses less digits than its factorization.

16820731564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16456 (or 16434 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 16820731564 in words is "sixteen billion, eight hundred twenty million, seven hundred thirty-one thousand, five hundred sixty-four".