19984074720 has 48 divisors (see below), whose sum is σ = 62949836880. Its totient is φ = 5329086464.

The previous prime is 19984074697. The next prime is 19984074727. The reversal of 19984074720 is 2747048991.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19984074727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20816265 + ... + 20817224.

It is an arithmetic number, because the mean of its divisors is an integer number (1311454935).

Almost surely, 2^19984074720 is an apocalyptic number.

19984074720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19984074720 is an abundant number, since it is smaller than the sum of its proper divisors (42965762160).

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

19984074720 is a wasteful number, since it uses less digits than its factorization.

19984074720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41633507 (or 41633499 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 51.

The spelling of 19984074720 in words is "nineteen billion, nine hundred eighty-four million, seventy-four thousand, seven hundred twenty".