19996544 has 32 divisors (see below), whose sum is σ = 41218200. Its totient is φ = 9651712.

The previous prime is 19996541. The next prime is 19996547. The reversal of 19996544 is 44569991.

It is an interprime number because it is at equal distance from previous prime (19996541) and next prime (19996547).

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19996541) 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, 1019 + ... + 6405.

Almost surely, 2^19996544 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 19996544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20609100).

19996544 is an abundant number, since it is smaller than the sum of its proper divisors (21221656).

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

19996544 is an equidigital number, since it uses as much as digits as its factorization.

19996544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5430 (or 5418 counting only the distinct ones).

The product of its digits is 349920, while the sum is 47.

The square root of 19996544 is about 4471.7495457595. The cubic root of 19996544 is about 271.4261257134.

The spelling of 19996544 in words is "nineteen million, nine hundred ninety-six thousand, five hundred forty-four".