20278558841 has 2 divisors, whose sum is σ = 20278558842. Its totient is φ = 20278558840.

The previous prime is 20278558771. The next prime is 20278558843. The reversal of 20278558841 is 14885587202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20117167225 + 161391616 = 141835^2 + 12704^2 .

It is a cyclic number.

It is not a de Polignac number, because 20278558841 - 2²⁶ = 20211449977 is a prime.

It is a super-2 number, since 2×20278558841² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 20278558843, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20278558841.

It is not a weakly prime, because it can be changed into another prime (20278558843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10139279420 + 10139279421.

It is an arithmetic number, because the mean of its divisors is an integer number (10139279421).

Almost surely, 2^20278558841 is an apocalyptic number.

It is an amenable number.

20278558841 is a deficient number, since it is larger than the sum of its proper divisors (1).

20278558841 is an equidigital number, since it uses as much as digits as its factorization.

20278558841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1433600, while the sum is 50.

The spelling of 20278558841 in words is "twenty billion, two hundred seventy-eight million, five hundred fifty-eight thousand, eight hundred forty-one".