19989504 has 110 divisors (see below), whose sum is σ = 59940254. Its totient is φ = 6635520.

The previous prime is 19989503. The next prime is 19989511. The reversal of 19989504 is 40598991.

It can be written as a sum of positive squares in only one way, i.e., 18662400 + 1327104 = 4320^2 + 1152^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19989504.

It is not an unprimeable number, because it can be changed into a prime (19989503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 82824 + ... + 83064.

Almost surely, 2^19989504 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 19989504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29970127).

19989504 is an abundant number, since it is smaller than the sum of its proper divisors (39950750).

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

19989504 is an equidigital number, since it uses as much as digits as its factorization.

19989504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 19989504 is about 4470.9623125229. The cubic root of 19989504 is about 271.3942691383.

The spelling of 19989504 in words is "nineteen million, nine hundred eighty-nine thousand, five hundred four".