19945984272 has 80 divisors (see below), whose sum is σ = 53151925440. Its totient is φ = 6440587776.

The previous prime is 19945984259. The next prime is 19945984297. The reversal of 19945984272 is 27248954991.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 382183 + ... + 431225.

It is an arithmetic number, because the mean of its divisors is an integer number (664399068).

Almost surely, 2^19945984272 is an apocalyptic number.

19945984272 is a gapful number since it is divisible by the number (12) 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 19945984272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26575962720).

19945984272 is an abundant number, since it is smaller than the sum of its proper divisors (33205941168).

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

19945984272 is a wasteful number, since it uses less digits than its factorization.

19945984272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49320 (or 49314 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 60.

The spelling of 19945984272 in words is "nineteen billion, nine hundred forty-five million, nine hundred eighty-four thousand, two hundred seventy-two".