19943689236 has 48 divisors (see below), whose sum is σ = 47916261120. Its totient is φ = 6451539840.

The previous prime is 19943689231. The next prime is 19943689237. The reversal of 19943689236 is 63298634991.

It is a self number, because there is not a number n which added to its sum of digits gives 19943689236.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19943689231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114981 + ... + 230451.

It is an arithmetic number, because the mean of its divisors is an integer number (998255440).

Almost surely, 2^19943689236 is an apocalyptic number.

It is an amenable number.

19943689236 is an abundant number, since it is smaller than the sum of its proper divisors (27972571884).

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

19943689236 is a wasteful number, since it uses less digits than its factorization.

19943689236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115904 (or 115902 counting only the distinct ones).

The product of its digits is 15116544, while the sum is 60.

The spelling of 19943689236 in words is "nineteen billion, nine hundred forty-three million, six hundred eighty-nine thousand, two hundred thirty-six".