20540364234989 has 2 divisors, whose sum is σ = 20540364234990. Its totient is φ = 20540364234988.

The previous prime is 20540364234983. The next prime is 20540364235141. The reversal of 20540364234989 is 98943246304502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20115673502500 + 424690732489 = 4485050^2 + 651683^2 .

It is a cyclic number.

It is not a de Polignac number, because 20540364234989 - 2⁴⁰ = 19440852607213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20540364234983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10270182117494 + 10270182117495.

It is an arithmetic number, because the mean of its divisors is an integer number (10270182117495).

Almost surely, 2^{20540364234989} is an apocalyptic number.

It is an amenable number.

20540364234989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20540364234989 is an equidigital number, since it uses as much as digits as its factorization.

20540364234989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 44789760, while the sum is 59.

The spelling of 20540364234989 in words is "twenty trillion, five hundred forty billion, three hundred sixty-four million, two hundred thirty-four thousand, nine hundred eighty-nine".