20423445343009 has 2 divisors, whose sum is σ = 20423445343010. Its totient is φ = 20423445343008.

The previous prime is 20423445342961. The next prime is 20423445343033. The reversal of 20423445343009 is 90034354432402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18615773160000 + 1807672183009 = 4314600^2 + 1344497^2 .

It is a cyclic number.

It is not a de Polignac number, because 20423445343009 - 2⁹ = 20423445342497 is a prime.

It is not a weakly prime, because it can be changed into another prime (20423445343309) 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, 10211722671504 + 10211722671505.

It is an arithmetic number, because the mean of its divisors is an integer number (10211722671505).

Almost surely, 2^{20423445343009} is an apocalyptic number.

It is an amenable number.

20423445343009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20423445343009 is an equidigital number, since it uses as much as digits as its factorization.

20423445343009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1244160, while the sum is 43.

The spelling of 20423445343009 in words is "twenty trillion, four hundred twenty-three billion, four hundred forty-five million, three hundred forty-three thousand, nine".