20677122657 has 24 divisors (see below), whose sum is σ = 30590926080. Its totient is φ = 13454385120.

The previous prime is 20677122649. The next prime is 20677122671. The reversal of 20677122657 is 75622177602.

It is not a de Polignac number, because 20677122657 - 2³ = 20677122649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20677120657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91569 + ... + 223022.

It is an arithmetic number, because the mean of its divisors is an integer number (1274621920).

Almost surely, 2^20677122657 is an apocalyptic number.

It is an amenable number.

20677122657 is a deficient number, since it is larger than the sum of its proper divisors (9913803423).

20677122657 is a wasteful number, since it uses less digits than its factorization.

20677122657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314773 (or 314770 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 45.

Subtracting 20677122657 from its reverse (75622177602), we obtain a palindrome (54945054945).

The spelling of 20677122657 in words is "twenty billion, six hundred seventy-seven million, one hundred twenty-two thousand, six hundred fifty-seven".