20344145256473 has 2 divisors, whose sum is σ = 20344145256474. Its totient is φ = 20344145256472.

The previous prime is 20344145256371. The next prime is 20344145256571. The reversal of 20344145256473 is 37465254144302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20085921719824 + 258223536649 = 4481732^2 + 508157^2 .

It is a cyclic number.

It is not a de Polignac number, because 20344145256473 - 2¹² = 20344145252377 is a prime.

It is not a weakly prime, because it can be changed into another prime (20344145456473) 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, 10172072628236 + 10172072628237.

It is an arithmetic number, because the mean of its divisors is an integer number (10172072628237).

Almost surely, 2^{20344145256473} is an apocalyptic number.

It is an amenable number.

20344145256473 is a deficient number, since it is larger than the sum of its proper divisors (1).

20344145256473 is an equidigital number, since it uses as much as digits as its factorization.

20344145256473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9676800, while the sum is 50.

The spelling of 20344145256473 in words is "twenty trillion, three hundred forty-four billion, one hundred forty-five million, two hundred fifty-six thousand, four hundred seventy-three".