19731091740 has 96 divisors (see below), whose sum is σ = 57231074880. Its totient is φ = 5075558400.

The previous prime is 19731091693. The next prime is 19731091741. The reversal of 19731091740 is 4719013791.

It is a junction number, because it is equal to n+sod(n) for n = 19731091692 and 19731091701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19731091741) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 173880 + ... + 264000.

It is an arithmetic number, because the mean of its divisors is an integer number (596157030).

Almost surely, 2^19731091740 is an apocalyptic number.

19731091740 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 19731091740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28615537440).

19731091740 is an abundant number, since it is smaller than the sum of its proper divisors (37499983140).

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

19731091740 is a wasteful number, since it uses less digits than its factorization.

19731091740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90263 (or 90261 counting only the distinct ones).

The product of its (nonzero) digits is 47628, while the sum is 42.

The spelling of 19731091740 in words is "nineteen billion, seven hundred thirty-one million, ninety-one thousand, seven hundred forty".