19996641280 has 288 divisors, whose sum is σ = 60904509120. Its totient is φ = 6230999040.

The previous prime is 19996641271. The next prime is 19996641283. The reversal of 19996641280 is 8214669991.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is not an unprimeable number, because it can be changed into a prime (19996641283) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5517549 + ... + 5521171.

It is an arithmetic number, because the mean of its divisors is an integer number (211473990).

Almost surely, 2^19996641280 is an apocalyptic number.

19996641280 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 19996641280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30452254560).

19996641280 is an abundant number, since it is smaller than the sum of its proper divisors (40907867840).

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

19996641280 is a wasteful number, since it uses less digits than its factorization.

19996641280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3675 (or 3648 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 55.

The spelling of 19996641280 in words is "nineteen billion, nine hundred ninety-six million, six hundred forty-one thousand, two hundred eighty".