19998464 has 36 divisors (see below), whose sum is σ = 40225920. Its totient is φ = 9922560.

The previous prime is 19998427. The next prime is 19998479. The reversal of 19998464 is 46489991.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48692 + ... + 49100.

Almost surely, 2^19998464 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 19998464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20112960).

19998464 is an abundant number, since it is smaller than the sum of its proper divisors (20227456).

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

19998464 is an equidigital number, since it uses as much as digits as its factorization.

19998464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616 (or 602 counting only the distinct ones).

The product of its digits is 559872, while the sum is 50.

The square root of 19998464 is about 4471.9642216816. The cubic root of 19998464 is about 271.4348125725.

The spelling of 19998464 in words is "nineteen million, nine hundred ninety-eight thousand, four hundred sixty-four".