20768963820657 has 16 divisors (see below), whose sum is σ = 29822217821760. Its totient is φ = 12780851130432.

The previous prime is 20768963820599. The next prime is 20768963820721. The reversal of 20768963820657 is 75602836986702.

It is not a de Polignac number, because 20768963820657 - 2⁶ = 20768963820593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20768963820591 and 20768963820600.

It is not an unprimeable number, because it can be changed into a prime (20768963825657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10855519 + ... + 12624587.

It is an arithmetic number, because the mean of its divisors is an integer number (1863888613860).

Almost surely, 2^{20768963820657} is an apocalyptic number.

It is an amenable number.

20768963820657 is a deficient number, since it is larger than the sum of its proper divisors (9053254001103).

20768963820657 is a wasteful number, since it uses less digits than its factorization.

20768963820657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070112.

The product of its (nonzero) digits is 365783040, while the sum is 69.

The spelling of 20768963820657 in words is "twenty trillion, seven hundred sixty-eight billion, nine hundred sixty-three million, eight hundred twenty thousand, six hundred fifty-seven".