19998282240 has 480 divisors, whose sum is σ = 73104071040. Its totient is φ = 5181456384.

The previous prime is 19998282229. The next prime is 19998282247. The reversal of 19998282240 is 4228289991.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19998282247) 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, 194158029 + ... + 194158131.

It is an arithmetic number, because the mean of its divisors is an integer number (152300148).

Almost surely, 2^19998282240 is an apocalyptic number.

19998282240 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 19998282240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36552035520).

19998282240 is an abundant number, since it is smaller than the sum of its proper divisors (53105788800).

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

19998282240 is an equidigital number, since it uses as much as digits as its factorization.

19998282240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The spelling of 19998282240 in words is "nineteen billion, nine hundred ninety-eight million, two hundred eighty-two thousand, two hundred forty".