20554243231 has 2 divisors, whose sum is σ = 20554243232. Its totient is φ = 20554243230.

The previous prime is 20554243223. The next prime is 20554243243. The reversal of 20554243231 is 13234245502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20554243231 - 2³ = 20554243223 is a prime.

It is a super-2 number, since 2×20554243231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20554243193 and 20554243202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20554243201) 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, 10277121615 + 10277121616.

It is an arithmetic number, because the mean of its divisors is an integer number (10277121616).

Almost surely, 2^20554243231 is an apocalyptic number.

20554243231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20554243231 is an equidigital number, since it uses as much as digits as its factorization.

20554243231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 20554243231 its reverse (13234245502), we get a palindrome (33788488733).

The spelling of 20554243231 in words is "twenty billion, five hundred fifty-four million, two hundred forty-three thousand, two hundred thirty-one".