20420140513 has 2 divisors, whose sum is σ = 20420140514. Its totient is φ = 20420140512.

The previous prime is 20420140511. The next prime is 20420140519. The reversal of 20420140513 is 31504102402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17278313809 + 3141826704 = 131447^2 + 56052^2 .

It is a cyclic number.

It is not a de Polignac number, because 20420140513 - 2¹ = 20420140511 is a prime.

Together with 20420140511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20420140511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210070256 + 10210070257.

It is an arithmetic number, because the mean of its divisors is an integer number (10210070257).

Almost surely, 2^20420140513 is an apocalyptic number.

It is an amenable number.

20420140513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420140513 is an equidigital number, since it uses as much as digits as its factorization.

20420140513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 20420140513 its reverse (31504102402), we get a palindrome (51924242915).

The spelling of 20420140513 in words is "twenty billion, four hundred twenty million, one hundred forty thousand, five hundred thirteen".