20908608919775 has 12 divisors (see below), whose sum is σ = 26820698339400. Its totient is φ = 16150097923680.

The previous prime is 20908608919753. The next prime is 20908608919819. The reversal of 20908608919775 is 57791980680902.

It is not a de Polignac number, because 20908608919775 - 2¹⁶ = 20908608854239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20908608919699 and 20908608919708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14419729565 + ... + 14419731014.

It is an arithmetic number, because the mean of its divisors is an integer number (2235058194950).

Almost surely, 2^{20908608919775} is an apocalyptic number.

20908608919775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20908608919775 is a deficient number, since it is larger than the sum of its proper divisors (5912089419625).

20908608919775 is a wasteful number, since it uses less digits than its factorization.

20908608919775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28839460618 (or 28839460613 counting only the distinct ones).

The product of its (nonzero) digits is 137168640, while the sum is 71.

The spelling of 20908608919775 in words is "twenty trillion, nine hundred eight billion, six hundred eight million, nine hundred nineteen thousand, seven hundred seventy-five".