19994773080 has 128 divisors (see below), whose sum is σ = 64611717120. Its totient is φ = 4935575040.

The previous prime is 19994773037. The next prime is 19994773109. The reversal of 19994773080 is 8037749991.

It is a self number, because there is not a number n which added to its sum of digits gives 19994773080.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31287 + ... + 202406.

It is an arithmetic number, because the mean of its divisors is an integer number (504779040).

Almost surely, 2^19994773080 is an apocalyptic number.

19994773080 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 19994773080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32305858560).

19994773080 is an abundant number, since it is smaller than the sum of its proper divisors (44616944040).

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

19994773080 is a wasteful number, since it uses less digits than its factorization.

19994773080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233761 (or 233757 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 57.

The spelling of 19994773080 in words is "nineteen billion, nine hundred ninety-four million, seven hundred seventy-three thousand, eighty".