20354440506247 has 2 divisors, whose sum is σ = 20354440506248. Its totient is φ = 20354440506246.

The previous prime is 20354440506233. The next prime is 20354440506289. The reversal of 20354440506247 is 74260504445302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20354440506247 - 2⁷ = 20354440506119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20354440506197 and 20354440506206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20354440506047) 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, 10177220253123 + 10177220253124.

It is an arithmetic number, because the mean of its divisors is an integer number (10177220253124).

Almost surely, 2^{20354440506247} is an apocalyptic number.

20354440506247 is a deficient number, since it is larger than the sum of its proper divisors (1).

20354440506247 is an equidigital number, since it uses as much as digits as its factorization.

20354440506247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3225600, while the sum is 46.

The spelling of 20354440506247 in words is "twenty trillion, three hundred fifty-four billion, four hundred forty million, five hundred six thousand, two hundred forty-seven".