20554243727 has 2 divisors, whose sum is σ = 20554243728. Its totient is φ = 20554243726.

The previous prime is 20554243691. The next prime is 20554243729. The reversal of 20554243727 is 72734245502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20554243727 - 2¹² = 20554239631 is a prime.

Together with 20554243729, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20554243729) 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, 10277121863 + 10277121864.

It is an arithmetic number, because the mean of its divisors is an integer number (10277121864).

Almost surely, 2^20554243727 is an apocalyptic number.

20554243727 is a deficient number, since it is larger than the sum of its proper divisors (1).

20554243727 is an equidigital number, since it uses as much as digits as its factorization.

20554243727 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 470400, while the sum is 41.

The spelling of 20554243727 in words is "twenty billion, five hundred fifty-four million, two hundred forty-three thousand, seven hundred twenty-seven".