20042513 has 2 divisors, whose sum is σ = 20042514. Its totient is φ = 20042512.

The previous prime is 20042489. The next prime is 20042521. The reversal of 20042513 is 31524002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13162384 + 6880129 = 3628^2 + 2623^2 .

It is a cyclic number.

It is not a de Polignac number, because 20042513 - 2¹⁴ = 20026129 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20042491 and 20042500.

It is not a weakly prime, because it can be changed into another prime (20042573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10021256 + 10021257.

It is an arithmetic number, because the mean of its divisors is an integer number (10021257).

Almost surely, 2^20042513 is an apocalyptic number.

It is an amenable number.

20042513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20042513 is an equidigital number, since it uses as much as digits as its factorization.

20042513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20042513 is about 4476.8865297213. The cubic root of 20042513 is about 271.6339556050.

Adding to 20042513 its reverse (31524002), we get a palindrome (51566515).

The spelling of 20042513 in words is "twenty million, forty-two thousand, five hundred thirteen".