19663672 has 64 divisors (see below), whose sum is σ = 44605440. Its totient is φ = 7948800.

The previous prime is 19663669. The next prime is 19663681. The reversal of 19663672 is 27636691.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81472 + ... + 81712.

It is an arithmetic number, because the mean of its divisors is an integer number (696960).

Almost surely, 2^19663672 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 19663672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22302720).

19663672 is an abundant number, since it is smaller than the sum of its proper divisors (24941768).

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

19663672 is a wasteful number, since it uses less digits than its factorization.

19663672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332 (or 328 counting only the distinct ones).

The product of its digits is 81648, while the sum is 40.

The square root of 19663672 is about 4434.3739129667. The cubic root of 19663672 is about 269.9115942848.

The spelling of 19663672 in words is "nineteen million, six hundred sixty-three thousand, six hundred seventy-two".