19847738820 has 192 divisors, whose sum is σ = 68499196416. Its totient is φ = 4181483520.

The previous prime is 19847738797. The next prime is 19847738821. The reversal of 19847738820 is 2883774891.

It is not an unprimeable number, because it can be changed into a prime (19847738821) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4349340 + ... + 4353900.

It is an arithmetic number, because the mean of its divisors is an integer number (356766648).

Almost surely, 2^19847738820 is an apocalyptic number.

19847738820 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 19847738820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34249598208).

19847738820 is an abundant number, since it is smaller than the sum of its proper divisors (48651457596).

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

19847738820 is a wasteful number, since it uses less digits than its factorization.

19847738820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5390 (or 5388 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 57.

The spelling of 19847738820 in words is "nineteen billion, eight hundred forty-seven million, seven hundred thirty-eight thousand, eight hundred twenty".