20705683057 has 2 divisors, whose sum is σ = 20705683058. Its totient is φ = 20705683056.

The previous prime is 20705683027. The next prime is 20705683157. The reversal of 20705683057 is 75038650702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10936139776 + 9769543281 = 104576^2 + 98841^2 .

It is a cyclic number.

It is not a de Polignac number, because 20705683057 - 2²⁷ = 20571465329 is a prime.

It is not a weakly prime, because it can be changed into another prime (20705683007) 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, 10352841528 + 10352841529.

It is an arithmetic number, because the mean of its divisors is an integer number (10352841529).

Almost surely, 2^20705683057 is an apocalyptic number.

It is an amenable number.

20705683057 is a deficient number, since it is larger than the sum of its proper divisors (1).

20705683057 is an equidigital number, since it uses as much as digits as its factorization.

20705683057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 352800, while the sum is 43.

The spelling of 20705683057 in words is "twenty billion, seven hundred five million, six hundred eighty-three thousand, fifty-seven".