16720403502 has 64 divisors (see below), whose sum is σ = 38542003200. Its totient is φ = 4787959680.

The previous prime is 16720403459. The next prime is 16720403507. The reversal of 16720403502 is 20530402761.

It is a self number, because there is not a number n which added to its sum of digits gives 16720403502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16720403507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2977 + ... + 182892.

It is an arithmetic number, because the mean of its divisors is an integer number (602218800).

Almost surely, 2^16720403502 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16720403502, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19271001600).

16720403502 is an abundant number, since it is smaller than the sum of its proper divisors (21821599698).

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

16720403502 is a wasteful number, since it uses less digits than its factorization.

16720403502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185961.

The product of its (nonzero) digits is 10080, while the sum is 30.

The spelling of 16720403502 in words is "sixteen billion, seven hundred twenty million, four hundred three thousand, five hundred two".