19847243136 has 256 divisors, whose sum is σ = 63736128000. Its totient is φ = 5345574912.

The previous prime is 19847243123. The next prime is 19847243153. The reversal of 19847243136 is 63134274891.

It is a super-2 number, since 2×19847243136² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11694640 + ... + 11696336.

It is an arithmetic number, because the mean of its divisors is an integer number (248969250).

Almost surely, 2^19847243136 is an apocalyptic number.

19847243136 is a gapful number since it is divisible by the number (16) 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 19847243136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31868064000).

19847243136 is an abundant number, since it is smaller than the sum of its proper divisors (43888884864).

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

19847243136 is a wasteful number, since it uses less digits than its factorization.

19847243136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969 (or 1957 counting only the distinct ones).

The product of its digits is 870912, while the sum is 48.

The spelling of 19847243136 in words is "nineteen billion, eight hundred forty-seven million, two hundred forty-three thousand, one hundred thirty-six".