20766971757 has 16 divisors (see below), whose sum is σ = 32026176000. Its totient is φ = 11723866032.

The previous prime is 20766971723. The next prime is 20766971767. The reversal of 20766971757 is 75717966702.

It is a happy number.

It is not a de Polignac number, because 20766971757 - 2⁸ = 20766971501 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20766971697 and 20766971706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20766971767) 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, 5955507 + ... + 5958992.

It is an arithmetic number, because the mean of its divisors is an integer number (2001636000).

Almost surely, 2^20766971757 is an apocalyptic number.

It is an amenable number.

20766971757 is a deficient number, since it is larger than the sum of its proper divisors (11259204243).

20766971757 is a wasteful number, since it uses less digits than its factorization.

20766971757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11914592.

The product of its (nonzero) digits is 7779240, while the sum is 57.

The spelling of 20766971757 in words is "twenty billion, seven hundred sixty-six million, nine hundred seventy-one thousand, seven hundred fifty-seven".