19933800444 has 18 divisors (see below), whose sum is σ = 50388217880. Its totient is φ = 6644600136.

The previous prime is 19933800443. The next prime is 19933800457. The reversal of 19933800444 is 44400833991.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 19933800444.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19933800443) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 276858304 + ... + 276858375.

Almost surely, 2^19933800444 is an apocalyptic number.

It is an amenable number.

19933800444 is an abundant number, since it is smaller than the sum of its proper divisors (30454417436).

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

19933800444 is a wasteful number, since it uses less digits than its factorization.

19933800444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553716689 (or 553716684 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 19933800444 in words is "nineteen billion, nine hundred thirty-three million, eight hundred thousand, four hundred forty-four".