20935307257 has 2 divisors, whose sum is σ = 20935307258. Its totient is φ = 20935307256.

The previous prime is 20935307233. The next prime is 20935307287. The reversal of 20935307257 is 75270353902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19459134016 + 1476173241 = 139496^2 + 38421^2 .

It is a cyclic number.

It is not a de Polignac number, because 20935307257 - 2¹⁹ = 20934782969 is a prime.

It is not a weakly prime, because it can be changed into another prime (20935307287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10467653628 + 10467653629.

It is an arithmetic number, because the mean of its divisors is an integer number (10467653629).

Almost surely, 2^20935307257 is an apocalyptic number.

It is an amenable number.

20935307257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20935307257 is an equidigital number, since it uses as much as digits as its factorization.

20935307257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 396900, while the sum is 43.

The spelling of 20935307257 in words is "twenty billion, nine hundred thirty-five million, three hundred seven thousand, two hundred fifty-seven".