20420040013 has 2 divisors, whose sum is σ = 20420040014. Its totient is φ = 20420040012.

The previous prime is 20420039989. The next prime is 20420040023. The reversal of 20420040013 is 31004002402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17831062089 + 2588977924 = 133533^2 + 50882^2 .

It is a cyclic number.

It is not a de Polignac number, because 20420040013 - 2²¹ = 20417942861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20420040023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210020006 + 10210020007.

It is an arithmetic number, because the mean of its divisors is an integer number (10210020007).

Almost surely, 2^20420040013 is an apocalyptic number.

It is an amenable number.

20420040013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420040013 is an equidigital number, since it uses as much as digits as its factorization.

20420040013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 20420040013 its reverse (31004002402), we get a palindrome (51424042415).

The spelling of 20420040013 in words is "twenty billion, four hundred twenty million, forty thousand, thirteen".