20768770757 has 32 divisors (see below), whose sum is σ = 24887869440. Its totient is φ = 16956812160.

The previous prime is 20768770739. The next prime is 20768770769. The reversal of 20768770757 is 75707786702.

It is a cyclic number.

It is not a de Polignac number, because 20768770757 - 2⁸ = 20768770501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20768770777) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10184744 + ... + 10186782.

It is an arithmetic number, because the mean of its divisors is an integer number (777745920).

Almost surely, 2^20768770757 is an apocalyptic number.

It is an amenable number.

20768770757 is a deficient number, since it is larger than the sum of its proper divisors (4119098683).

20768770757 is a wasteful number, since it uses less digits than its factorization.

20768770757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2793.

The product of its (nonzero) digits is 8067360, while the sum is 56.

The spelling of 20768770757 in words is "twenty billion, seven hundred sixty-eight million, seven hundred seventy thousand, seven hundred fifty-seven".