19730816 has 96 divisors (see below), whose sum is σ = 48188880. Its totient is φ = 7879680.

The previous prime is 19730813. The next prime is 19730833. The reversal of 19730816 is 61803791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19730813) 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, 323426 + ... + 323486.

Almost surely, 2^19730816 is an apocalyptic number.

19730816 is a gapful number since it is divisible by the number (16) 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 19730816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24094440).

19730816 is an abundant number, since it is smaller than the sum of its proper divisors (28458064).

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

19730816 is an equidigital number, since it uses as much as digits as its factorization.

19730816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 19730816 is about 4441.9383156455. The cubic root of 19730816 is about 270.2184605958.

It can be divided in two parts, 197 and 30816, that added together give a palindrome (31013).

The spelling of 19730816 in words is "nineteen million, seven hundred thirty thousand, eight hundred sixteen".