20540293 has 2 divisors, whose sum is σ = 20540294. Its totient is φ = 20540292.

The previous prime is 20540281. The next prime is 20540329. The reversal of 20540293 is 39204502.

It is a happy number.

Together with next prime (20540329) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20448484 + 91809 = 4522^2 + 303^2 .

It is a cyclic number.

It is not a de Polignac number, because 20540293 - 2⁹ = 20539781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20540243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10270146 + 10270147.

It is an arithmetic number, because the mean of its divisors is an integer number (10270147).

Almost surely, 2^20540293 is an apocalyptic number.

It is an amenable number.

20540293 is a deficient number, since it is larger than the sum of its proper divisors (1).

20540293 is an equidigital number, since it uses as much as digits as its factorization.

20540293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20540293 is about 4532.1400022506. The cubic root of 20540293 is about 273.8643769111.

Adding to 20540293 its reverse (39204502), we get a palindrome (59744795).

The spelling of 20540293 in words is "twenty million, five hundred forty thousand, two hundred ninety-three".