20257460677 has 2 divisors, whose sum is σ = 20257460678. Its totient is φ = 20257460676.

The previous prime is 20257460633. The next prime is 20257460693. The reversal of 20257460677 is 77606475202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13848817761 + 6408642916 = 117681^2 + 80054^2 .

It is a cyclic number.

It is not a de Polignac number, because 20257460677 - 2⁷ = 20257460549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20257560677) 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 as a sum of consecutive naturals, namely, 10128730338 + 10128730339.

It is an arithmetic number, because the mean of its divisors is an integer number (10128730339).

Almost surely, 2^20257460677 is an apocalyptic number.

It is an amenable number.

20257460677 is a deficient number, since it is larger than the sum of its proper divisors (1).

20257460677 is an equidigital number, since it uses as much as digits as its factorization.

20257460677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 987840, while the sum is 46.

The spelling of 20257460677 in words is "twenty billion, two hundred fifty-seven million, four hundred sixty thousand, six hundred seventy-seven".