20123440013 has 2 divisors, whose sum is σ = 20123440014. Its totient is φ = 20123440012.

The previous prime is 20123439983. The next prime is 20123440033. The reversal of 20123440013 is 31004432102.

It is an a-pointer prime, because the next prime (20123440033) can be obtained adding 20123440013 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17741707204 + 2381732809 = 133198^2 + 48803^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123440013 - 2⁸ = 20123439757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123440033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061720006 + 10061720007.

It is an arithmetic number, because the mean of its divisors is an integer number (10061720007).

Almost surely, 2^20123440013 is an apocalyptic number.

It is an amenable number.

20123440013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123440013 is an equidigital number, since it uses as much as digits as its factorization.

20123440013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20123440013 its reverse (31004432102), we get a palindrome (51127872115).

The spelling of 20123440013 in words is "twenty billion, one hundred twenty-three million, four hundred forty thousand, thirteen".