20756843663768 has 16 divisors (see below), whose sum is σ = 38920902284880. Its totient is φ = 10377936387808.

The previous prime is 20756843663749. The next prime is 20756843663771. The reversal of 20756843663768 is 86736634865702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60498755 + ... + 60840882.

It is an arithmetic number, because the mean of its divisors is an integer number (2432556392805).

Almost surely, 2^{20756843663768} is an apocalyptic number.

It is an amenable number.

20756843663768 is a deficient number, since it is larger than the sum of its proper divisors (18164058621112).

20756843663768 is a wasteful number, since it uses less digits than its factorization.

20756843663768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121361026 (or 121361022 counting only the distinct ones).

The product of its (nonzero) digits is 1463132160, while the sum is 71.

The spelling of 20756843663768 in words is "twenty trillion, seven hundred fifty-six billion, eight hundred forty-three million, six hundred sixty-three thousand, seven hundred sixty-eight".