19997696 has 44 divisors (see below), whose sum is σ = 40776240. Its totient is φ = 9799680.

The previous prime is 19997689. The next prime is 19997699. The reversal of 19997696 is 69679991.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (19997699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60251 + ... + 60581.

Almost surely, 2^19997696 is an apocalyptic number.

19997696 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 19997696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20388120).

19997696 is an abundant number, since it is smaller than the sum of its proper divisors (20778544).

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

19997696 is an equidigital number, since it uses as much as digits as its factorization.

19997696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410 (or 392 counting only the distinct ones).

The product of its digits is 1653372, while the sum is 56.

The square root of 19997696 is about 4471.8783525494. The cubic root of 19997696 is about 271.4313378956.

The spelling of 19997696 in words is "nineteen million, nine hundred ninety-seven thousand, six hundred ninety-six".