19953427968 has 120 divisors (see below), whose sum is σ = 57691062000. Its totient is φ = 6639120384.

The previous prime is 19953427943. The next prime is 19953428023. The reversal of 19953427968 is 86972435991.

19953427968 is a `hidden beast` number, since 1 + 9 + 9 + 534 + 2 + 7 + 96 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2756578 + ... + 2763806.

It is an arithmetic number, because the mean of its divisors is an integer number (480758850).

Almost surely, 2^19953427968 is an apocalyptic number.

19953427968 is a gapful number since it is divisible by the number (18) 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 19953427968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28845531000).

19953427968 is an abundant number, since it is smaller than the sum of its proper divisors (37737634032).

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

19953427968 is an equidigital number, since it uses as much as digits as its factorization.

19953427968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7852 (or 7833 counting only the distinct ones).

The product of its digits is 29393280, while the sum is 63.

The spelling of 19953427968 in words is "nineteen billion, nine hundred fifty-three million, four hundred twenty-seven thousand, nine hundred sixty-eight".