19995578080 has 96 divisors (see below), whose sum is σ = 49437864000. Its totient is φ = 7628070912.

The previous prime is 19995578063. The next prime is 19995578111. The reversal of 19995578080 is 8087559991.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1276536 + ... + 1292104.

It is an arithmetic number, because the mean of its divisors is an integer number (514977750).

Almost surely, 2^19995578080 is an apocalyptic number.

19995578080 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 19995578080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24718932000).

19995578080 is an abundant number, since it is smaller than the sum of its proper divisors (29442285920).

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

19995578080 is a wasteful number, since it uses less digits than its factorization.

19995578080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15956 (or 15948 counting only the distinct ones).

The product of its (nonzero) digits is 8164800, while the sum is 61.

The spelling of 19995578080 in words is "nineteen billion, nine hundred ninety-five million, five hundred seventy-eight thousand, eighty".