19984711140 has 144 divisors (see below), whose sum is σ = 62062640640. Its totient is φ = 5203019520.

The previous prime is 19984711129. The next prime is 19984711141. The reversal of 19984711140 is 4111748991.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (19984711141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3711250 + ... + 3716630.

It is an arithmetic number, because the mean of its divisors is an integer number (430990560).

Almost surely, 2^19984711140 is an apocalyptic number.

19984711140 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 19984711140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31031320320).

19984711140 is an abundant number, since it is smaller than the sum of its proper divisors (42077929500).

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

19984711140 is a wasteful number, since it uses less digits than its factorization.

19984711140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5882 (or 5877 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The spelling of 19984711140 in words is "nineteen billion, nine hundred eighty-four million, seven hundred eleven thousand, one hundred forty".