20896457 has 2 divisors, whose sum is σ = 20896458. Its totient is φ = 20896456.

The previous prime is 20896441. The next prime is 20896459. The reversal of 20896457 is 75469802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18412681 + 2483776 = 4291^2 + 1576^2 .

It is a cyclic number.

It is not a de Polignac number, because 20896457 - 2⁴ = 20896441 is a prime.

Together with 20896459, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20896459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10448228 + 10448229.

It is an arithmetic number, because the mean of its divisors is an integer number (10448229).

Almost surely, 2^20896457 is an apocalyptic number.

It is an amenable number.

20896457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20896457 is an equidigital number, since it uses as much as digits as its factorization.

20896457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 20896457 is about 4571.2642671366. The cubic root of 20896457 is about 275.4382302066.

The spelling of 20896457 in words is "twenty million, eight hundred ninety-six thousand, four hundred fifty-seven".