19910448 has 80 divisors (see below), whose sum is σ = 57957600. Its totient is φ = 6625152.

The previous prime is 19910441. The next prime is 19910467. The reversal of 19910448 is 84401991.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (19910441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34708 + ... + 35276.

It is an arithmetic number, because the mean of its divisors is an integer number (724470).

Almost surely, 2^19910448 is an apocalyptic number.

19910448 is a gapful number since it is divisible by the number (18) 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 19910448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28978800).

19910448 is an abundant number, since it is smaller than the sum of its proper divisors (38047152).

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

19910448 is an frugal number, since it uses more digits than its factorization.

19910448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 19910448 is about 4462.1125041845. The cubic root of 19910448 is about 271.0360195947.

The spelling of 19910448 in words is "nineteen million, nine hundred ten thousand, four hundred forty-eight".