19986266720 has 192 divisors, whose sum is σ = 55493859456. Its totient is φ = 6659358720.

The previous prime is 19986266717. The next prime is 19986266731. The reversal of 19986266720 is 2766268991.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (56).

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, 14555954 + ... + 14557326.

It is an arithmetic number, because the mean of its divisors is an integer number (289030518).

Almost surely, 2^19986266720 is an apocalyptic number.

19986266720 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 19986266720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27746929728).

19986266720 is an abundant number, since it is smaller than the sum of its proper divisors (35507592736).

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

19986266720 is a wasteful number, since it uses less digits than its factorization.

19986266720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1753 (or 1745 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 56.

The spelling of 19986266720 in words is "nineteen billion, nine hundred eighty-six million, two hundred sixty-six thousand, seven hundred twenty".