20013613 has 2 divisors, whose sum is σ = 20013614. Its totient is φ = 20013612.

The previous prime is 20013589. The next prime is 20013659. The reversal of 20013613 is 31631002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17330569 + 2683044 = 4163^2 + 1638^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20013613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20013313) 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, 10006806 + 10006807.

It is an arithmetic number, because the mean of its divisors is an integer number (10006807).

Almost surely, 2^20013613 is an apocalyptic number.

It is an amenable number.

20013613 is a deficient number, since it is larger than the sum of its proper divisors (1).

20013613 is an equidigital number, since it uses as much as digits as its factorization.

20013613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 20013613 is about 4473.6576757727. The cubic root of 20013613 is about 271.5033333037.

Adding to 20013613 its reverse (31631002), we get a palindrome (51644615).

The spelling of 20013613 in words is "twenty million, thirteen thousand, six hundred thirteen".