19980797760 has 504 divisors, whose sum is σ = 86343548928. Its totient is φ = 4151347200.

The previous prime is 19980797719. The next prime is 19980797773. The reversal of 19980797760 is 6779708991.

It is a tau number, because it is divible by the number of its divisors (504).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2435265 + ... + 2443455.

Almost surely, 2^19980797760 is an apocalyptic number.

19980797760 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 19980797760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43171774464).

19980797760 is an abundant number, since it is smaller than the sum of its proper divisors (66362751168).

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

19980797760 is a wasteful number, since it uses less digits than its factorization.

19980797760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8243 (or 8219 counting only the distinct ones).

The product of its (nonzero) digits is 12002256, while the sum is 63.

The spelling of 19980797760 in words is "nineteen billion, nine hundred eighty million, seven hundred ninety-seven thousand, seven hundred sixty".