20512585957 has 2 divisors, whose sum is σ = 20512585958. Its totient is φ = 20512585956.

The previous prime is 20512585943. The next prime is 20512585963. The reversal of 20512585957 is 75958521502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20096181121 + 416404836 = 141761^2 + 20406^2 .

It is a cyclic number.

It is not a de Polignac number, because 20512585957 - 2²³ = 20504197349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20512585957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20512585757) 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, 10256292978 + 10256292979.

It is an arithmetic number, because the mean of its divisors is an integer number (10256292979).

Almost surely, 2^20512585957 is an apocalyptic number.

It is an amenable number.

20512585957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20512585957 is an equidigital number, since it uses as much as digits as its factorization.

20512585957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260000, while the sum is 49.

The spelling of 20512585957 in words is "twenty billion, five hundred twelve million, five hundred eighty-five thousand, nine hundred fifty-seven".