20503013 has 2 divisors, whose sum is σ = 20503014. Its totient is φ = 20503012.

The previous prime is 20503001. The next prime is 20503027. The reversal of 20503013 is 31030502.

It is an a-pointer prime, because the next prime (20503027) can be obtained adding 20503013 to its sum of digits (14).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17623204 + 2879809 = 4198^2 + 1697^2 .

It is a cyclic number.

It is not a de Polignac number, because 20503013 - 2¹⁰ = 20501989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20503073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10251506 + 10251507.

It is an arithmetic number, because the mean of its divisors is an integer number (10251507).

Almost surely, 2^20503013 is an apocalyptic number.

It is an amenable number.

20503013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20503013 is an equidigital number, since it uses as much as digits as its factorization.

20503013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 14.

The square root of 20503013 is about 4528.0252870319. The cubic root of 20503013 is about 273.6985914320.

Adding to 20503013 its reverse (31030502), we get a palindrome (51533515).

The spelling of 20503013 in words is "twenty million, five hundred three thousand, thirteen".