19720297991760 has 80 divisors (see below), whose sum is σ = 61238873812416. Its totient is φ = 5249632149504.

The previous prime is 19720297991747. The next prime is 19720297991777. The reversal of 19720297991760 is 6719979202791.

19720297991760 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71064214 + ... + 71341173.

Almost surely, 2^{19720297991760} is an apocalyptic number.

19720297991760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19720297991760 is an abundant number, since it is smaller than the sum of its proper divisors (41518575820656).

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

19720297991760 is a wasteful number, since it uses less digits than its factorization.

19720297991760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142405980 (or 142405974 counting only the distinct ones).

The product of its (nonzero) digits is 54010152, while the sum is 69.

The spelling of 19720297991760 in words is "nineteen trillion, seven hundred twenty billion, two hundred ninety-seven million, nine hundred ninety-one thousand, seven hundred sixty".