20016613 has 2 divisors, whose sum is σ = 20016614. Its totient is φ = 20016612.

The previous prime is 20016611. The next prime is 20016631. The reversal of 20016613 is 31661002.

It is the 1827-th star number.

Together with next prime (20016631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11819844 + 8196769 = 3438^2 + 2863^2 .

It is a cyclic number.

It is not a de Polignac number, because 20016613 - 2¹ = 20016611 is a prime.

Together with 20016611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20016611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10008306 + 10008307.

It is an arithmetic number, because the mean of its divisors is an integer number (10008307).

Almost surely, 2^20016613 is an apocalyptic number.

It is an amenable number.

20016613 is a deficient number, since it is larger than the sum of its proper divisors (1).

20016613 is an equidigital number, since it uses as much as digits as its factorization.

20016613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 20016613 is about 4473.9929593150. The cubic root of 20016613 is about 271.5168985589.

Adding to 20016613 its reverse (31661002), we get a palindrome (51677615).

The spelling of 20016613 in words is "twenty million, sixteen thousand, six hundred thirteen".