20841094657 has 2 divisors, whose sum is σ = 20841094658. Its totient is φ = 20841094656.

The previous prime is 20841094639. The next prime is 20841094691. The reversal of 20841094657 is 75649014802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20708361216 + 132733441 = 143904^2 + 11521^2 .

It is a cyclic number.

It is not a de Polignac number, because 20841094657 - 2²⁷ = 20706876929 is a prime.

It is not a weakly prime, because it can be changed into another prime (20841094607) 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, 10420547328 + 10420547329.

It is an arithmetic number, because the mean of its divisors is an integer number (10420547329).

Almost surely, 2^20841094657 is an apocalyptic number.

It is an amenable number.

20841094657 is a deficient number, since it is larger than the sum of its proper divisors (1).

20841094657 is an equidigital number, since it uses as much as digits as its factorization.

20841094657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 20841094657 in words is "twenty billion, eight hundred forty-one million, ninety-four thousand, six hundred fifty-seven".