20919884278276 has 27 divisors (see below), whose sum is σ = 38271118380103. Its totient is φ = 10005061421960.

The previous prime is 20919884278247. The next prime is 20919884278313. The reversal of 20919884278276 is 67287248891902.

The square root of 20919884278276 is 4573826.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20919884278199 and 20919884278208.

It is an unprimeable number.

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, 210346281 + ... + 210445711.

Almost surely, 2^{20919884278276} is an apocalyptic number.

20919884278276 is the 4573826-th square number.

It is an amenable number.

20919884278276 is a deficient number, since it is larger than the sum of its proper divisors (17351234101827).

20919884278276 is an frugal number, since it uses more digits than its factorization.

20919884278276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198912 (or 99456 counting only the distinct ones).

The product of its (nonzero) digits is 390168576, while the sum is 73.

The spelling of 20919884278276 in words is "twenty trillion, nine hundred nineteen billion, eight hundred eighty-four million, two hundred seventy-eight thousand, two hundred seventy-six".