19726143776 has 48 divisors (see below), whose sum is σ = 39614017464. Its totient is φ = 9665869824.

The previous prime is 19726143769. The next prime is 19726143791. The reversal of 19726143776 is 67734162791.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12343210000 + 7382933776 = 111100^2 + 85924^2 .

It is a Harshad number since it is a multiple of its sum of digits (53).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1582946 + ... + 1595358.

Almost surely, 2^19726143776 is an apocalyptic number.

19726143776 is a gapful number since it is divisible by the number (16) 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 19726143776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19807008732).

19726143776 is an abundant number, since it is smaller than the sum of its proper divisors (19887873688).

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

19726143776 is a wasteful number, since it uses less digits than its factorization.

19726143776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13413 (or 13405 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 53.

The spelling of 19726143776 in words is "nineteen billion, seven hundred twenty-six million, one hundred forty-three thousand, seven hundred seventy-six".