19944918680 has 64 divisors (see below), whose sum is σ = 45647971200. Its totient is φ = 7840949760.

The previous prime is 19944918677. The next prime is 19944918683. The reversal of 19944918680 is 8681944991.

It is an interprime number because it is at equal distance from previous prime (19944918677) and next prime (19944918683).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19944918683) 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 15 ways as a sum of consecutive naturals, for example, 4167569 + ... + 4172351.

It is an arithmetic number, because the mean of its divisors is an integer number (713249550).

Almost surely, 2^19944918680 is an apocalyptic number.

19944918680 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 19944918680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22823985600).

19944918680 is an abundant number, since it is smaller than the sum of its proper divisors (25703052520).

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

19944918680 is a wasteful number, since it uses less digits than its factorization.

19944918680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6564 (or 6560 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 59.

The spelling of 19944918680 in words is "nineteen billion, nine hundred forty-four million, nine hundred eighteen thousand, six hundred eighty".