20320847 has 2 divisors, whose sum is σ = 20320848. Its totient is φ = 20320846.

The previous prime is 20320837. The next prime is 20320849. The reversal of 20320847 is 74802302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20320847 - 2¹⁰ = 20319823 is a prime.

Together with 20320849, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20320849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160423 + 10160424.

It is an arithmetic number, because the mean of its divisors is an integer number (10160424).

Almost surely, 2^20320847 is an apocalyptic number.

20320847 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320847 is an equidigital number, since it uses as much as digits as its factorization.

20320847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20320847 is about 4507.8650157253. The cubic root of 20320847 is about 272.8855894169.

The spelling of 20320847 in words is "twenty million, three hundred twenty thousand, eight hundred forty-seven".