19912480 has 96 divisors (see below), whose sum is σ = 56173824. Its totient is φ = 6521856.

The previous prime is 19912469. The next prime is 19912481. The reversal of 19912480 is 8421991.

It is not an unprimeable number, because it can be changed into a prime (19912481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25374 + ... + 26146.

It is an arithmetic number, because the mean of its divisors is an integer number (585144).

Almost surely, 2^19912480 is an apocalyptic number.

19912480 is a gapful number since it is divisible by the number (10) 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 19912480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28086912).

19912480 is an abundant number, since it is smaller than the sum of its proper divisors (36261344).

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

19912480 is a wasteful number, since it uses less digits than its factorization.

19912480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818 (or 810 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 19912480 is about 4462.3401932170. The cubic root of 19912480 is about 271.0452396527.

The spelling of 19912480 in words is "nineteen million, nine hundred twelve thousand, four hundred eighty".