19954459872 has 72 divisors (see below), whose sum is σ = 57952885536. Its totient is φ = 6509961216.

The previous prime is 19954459829. The next prime is 19954459913. The reversal of 19954459872 is 27895445991.

19954459872 is a `hidden beast` number, since 1 + 9 + 9 + 544 + 5 + 9 + 87 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 723553 + ... + 750624.

It is an arithmetic number, because the mean of its divisors is an integer number (804901188).

Almost surely, 2^19954459872 is an apocalyptic number.

19954459872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19954459872 is an abundant number, since it is smaller than the sum of its proper divisors (37998425664).

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

19954459872 is a wasteful number, since it uses less digits than its factorization.

19954459872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474240 (or 1474229 counting only the distinct ones).

The product of its digits is 32659200, while the sum is 63.

The spelling of 19954459872 in words is "nineteen billion, nine hundred fifty-four million, four hundred fifty-nine thousand, eight hundred seventy-two".