20954160817 has 2 divisors, whose sum is σ = 20954160818. Its totient is φ = 20954160816.

The previous prime is 20954160797. The next prime is 20954160919. The reversal of 20954160817 is 71806145902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15868188961 + 5085971856 = 125969^2 + 71316^2 .

It is a cyclic number.

It is not a de Polignac number, because 20954160817 - 2²³ = 20945772209 is a prime.

It is not a weakly prime, because it can be changed into another prime (20954164817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10477080408 + 10477080409.

It is an arithmetic number, because the mean of its divisors is an integer number (10477080409).

Almost surely, 2^20954160817 is an apocalyptic number.

It is an amenable number.

20954160817 is a deficient number, since it is larger than the sum of its proper divisors (1).

20954160817 is an equidigital number, since it uses as much as digits as its factorization.

20954160817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 20954160817 in words is "twenty billion, nine hundred fifty-four million, one hundred sixty thousand, eight hundred seventeen".