20319613 has 2 divisors, whose sum is σ = 20319614. Its totient is φ = 20319612.

The previous prime is 20319599. The next prime is 20319631. The reversal of 20319613 is 31691302.

Together with next prime (20319631) 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., 16867449 + 3452164 = 4107^2 + 1858^2 .

It is a cyclic number.

It is not a de Polignac number, because 20319613 - 2⁵ = 20319581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20319413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10159806 + 10159807.

It is an arithmetic number, because the mean of its divisors is an integer number (10159807).

Almost surely, 2^20319613 is an apocalyptic number.

It is an amenable number.

20319613 is a deficient number, since it is larger than the sum of its proper divisors (1).

20319613 is an equidigital number, since it uses as much as digits as its factorization.

20319613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 20319613 is about 4507.7281417583. The cubic root of 20319613 is about 272.8800655718.

The spelling of 20319613 in words is "twenty million, three hundred nineteen thousand, six hundred thirteen".