20315111303909 has 2 divisors, whose sum is σ = 20315111303910. Its totient is φ = 20315111303908.

The previous prime is 20315111303863. The next prime is 20315111304017. The reversal of 20315111303909 is 90930311151302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15709752383809 + 4605358920100 = 3963553^2 + 2146010^2 .

It is a cyclic number.

It is not a de Polignac number, because 20315111303909 - 2⁸ = 20315111303653 is a prime.

It is a super-2 number, since 2×20315111303909² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20315111303309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10157555651954 + 10157555651955.

It is an arithmetic number, because the mean of its divisors is an integer number (10157555651955).

Almost surely, 2^{20315111303909} is an apocalyptic number.

It is an amenable number.

20315111303909 is a deficient number, since it is larger than the sum of its proper divisors (1).

20315111303909 is an equidigital number, since it uses as much as digits as its factorization.

20315111303909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 38.

The spelling of 20315111303909 in words is "twenty trillion, three hundred fifteen billion, one hundred eleven million, three hundred three thousand, nine hundred nine".