19999820867772 has 96 divisors (see below), whose sum is σ = 48605449052160. Its totient is φ = 6395326096320.

The previous prime is 19999820867771. The next prime is 19999820867797. The reversal of 19999820867772 is 27776802899991.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19999820867771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32913333 + ... + 33515475.

It is an arithmetic number, because the mean of its divisors is an integer number (506306760960).

Almost surely, 2^{19999820867772} is an apocalyptic number.

19999820867772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19999820867772 is an abundant number, since it is smaller than the sum of its proper divisors (28605628184388).

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

19999820867772 is a wasteful number, since it uses less digits than its factorization.

19999820867772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603343 (or 603341 counting only the distinct ones).

The product of its (nonzero) digits is 3456649728, while the sum is 84.

The spelling of 19999820867772 in words is "nineteen trillion, nine hundred ninety-nine billion, eight hundred twenty million, eight hundred sixty-seven thousand, seven hundred seventy-two".