19720448 has 72 divisors (see below), whose sum is σ = 44150400. Its totient is φ = 8714240.

The previous prime is 19720447. The next prime is 19720451. The reversal of 19720448 is 84402791.

It is not an unprimeable number, because it can be changed into a prime (19720447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132278 + ... + 132426.

It is an arithmetic number, because the mean of its divisors is an integer number (613200).

Almost surely, 2^19720448 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 19720448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22075200).

19720448 is an abundant number, since it is smaller than the sum of its proper divisors (24429952).

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

19720448 is a wasteful number, since it uses less digits than its factorization.

19720448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 19720448 is about 4440.7711042115. The cubic root of 19720448 is about 270.1711215185.

The spelling of 19720448 in words is "nineteen million, seven hundred twenty thousand, four hundred forty-eight".