19754138236 has 24 divisors (see below), whose sum is σ = 40576069856. Its totient is φ = 8237246400.

The previous prime is 19754138219. The next prime is 19754138237. The reversal of 19754138236 is 63283145791.

It is a self number, because there is not a number n which added to its sum of digits gives 19754138236.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19754138237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9532815 + ... + 9534886.

Almost surely, 2^19754138236 is an apocalyptic number.

It is an amenable number.

19754138236 is an abundant number, since it is smaller than the sum of its proper divisors (20821931620).

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

19754138236 is a wasteful number, since it uses less digits than its factorization.

19754138236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19067749 (or 19067747 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 49.

The spelling of 19754138236 in words is "nineteen billion, seven hundred fifty-four million, one hundred thirty-eight thousand, two hundred thirty-six".