19786923556 has 27 divisors (see below), whose sum is σ = 35234638803. Its totient is φ = 9722833920.

The previous prime is 19786923553. The next prime is 19786923571. The reversal of 19786923556 is 65532968791.

The square root of 19786923556 is 140666.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1665456100 + 18121467456 = 40810^2 + 134616^2 .

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19786923494 and 19786923503.

It is not an unprimeable number, because it can be changed into a prime (19786923553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 17160676 + ... + 17161828.

Almost surely, 2^19786923556 is an apocalyptic number.

19786923556 is the 140666-th square number.

It is an amenable number.

19786923556 is a deficient number, since it is larger than the sum of its proper divisors (15447715247).

19786923556 is an frugal number, since it uses more digits than its factorization.

19786923556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2432 (or 1216 counting only the distinct ones).

The product of its digits is 24494400, while the sum is 61.

The spelling of 19786923556 in words is "nineteen billion, seven hundred eighty-six million, nine hundred twenty-three thousand, five hundred fifty-six".