20394613 has 2 divisors, whose sum is σ = 20394614. Its totient is φ = 20394612.

The previous prime is 20394601. The next prime is 20394631. The reversal of 20394613 is 31649302.

Together with next prime (20394631) 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., 20007729 + 386884 = 4473^2 + 622^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20394613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20394643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10197306 + 10197307.

It is an arithmetic number, because the mean of its divisors is an integer number (10197307).

Almost surely, 2^20394613 is an apocalyptic number.

It is an amenable number.

20394613 is a deficient number, since it is larger than the sum of its proper divisors (1).

20394613 is an equidigital number, since it uses as much as digits as its factorization.

20394613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 20394613 is about 4516.0395259563. The cubic root of 20394613 is about 273.2153881706.

The spelling of 20394613 in words is "twenty million, three hundred ninety-four thousand, six hundred thirteen".