20975343457 has 2 divisors, whose sum is σ = 20975343458. Its totient is φ = 20975343456.

The previous prime is 20975343443. The next prime is 20975343469. The reversal of 20975343457 is 75434357902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18214471521 + 2760871936 = 134961^2 + 52544^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20975343457 is a prime.

It is a super-2 number, since 2×20975343457² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20975343457.

It is not a weakly prime, because it can be changed into another prime (20975343407) 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, 10487671728 + 10487671729.

It is an arithmetic number, because the mean of its divisors is an integer number (10487671729).

Almost surely, 2^20975343457 is an apocalyptic number.

It is an amenable number.

20975343457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20975343457 is an equidigital number, since it uses as much as digits as its factorization.

20975343457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3175200, while the sum is 49.

The spelling of 20975343457 in words is "twenty billion, nine hundred seventy-five million, three hundred forty-three thousand, four hundred fifty-seven".