20542241231 has 2 divisors, whose sum is σ = 20542241232. Its totient is φ = 20542241230.

The previous prime is 20542241201. The next prime is 20542241243. The reversal of 20542241231 is 13214224502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20542241231 - 2²² = 20538046927 is a prime.

It is a super-2 number, since 2×20542241231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20542241231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20542241201) 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, 10271120615 + 10271120616.

It is an arithmetic number, because the mean of its divisors is an integer number (10271120616).

Almost surely, 2^20542241231 is an apocalyptic number.

20542241231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20542241231 is an equidigital number, since it uses as much as digits as its factorization.

20542241231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 20542241231 its reverse (13214224502), we get a palindrome (33756465733).

The spelling of 20542241231 in words is "twenty billion, five hundred forty-two million, two hundred forty-one thousand, two hundred thirty-one".