19913984 has 36 divisors (see below), whose sum is σ = 40176864. Its totient is φ = 9850368.

The previous prime is 19913977. The next prime is 19913989. The reversal of 19913984 is 48931991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19913989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27029 + ... + 27755.

It is an arithmetic number, because the mean of its divisors is an integer number (1116024).

Almost surely, 2^19913984 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 19913984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20088432).

19913984 is an abundant number, since it is smaller than the sum of its proper divisors (20262880).

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

19913984 is an equidigital number, since it uses as much as digits as its factorization.

19913984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850 (or 836 counting only the distinct ones).

The product of its digits is 69984, while the sum is 44.

The square root of 19913984 is about 4462.5087114761. The cubic root of 19913984 is about 271.0520635437.

The spelling of 19913984 in words is "nineteen million, nine hundred thirteen thousand, nine hundred eighty-four".