20869393 has 2 divisors, whose sum is σ = 20869394. Its totient is φ = 20869392.

The previous prime is 20869339. The next prime is 20869397. The reversal of 20869393 is 39396802.

Together with previous prime (20869339) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14684224 + 6185169 = 3832^2 + 2487^2 .

It is a cyclic number.

It is not a de Polignac number, because 20869393 - 2¹⁷ = 20738321 is a prime.

It is not a weakly prime, because it can be changed into another prime (20869397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10434696 + 10434697.

It is an arithmetic number, because the mean of its divisors is an integer number (10434697).

Almost surely, 2^20869393 is an apocalyptic number.

It is an amenable number.

20869393 is a deficient number, since it is larger than the sum of its proper divisors (1).

20869393 is an equidigital number, since it uses as much as digits as its factorization.

20869393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 20869393 is about 4568.3030766358. The cubic root of 20869393 is about 275.3192677626.

The spelling of 20869393 in words is "twenty million, eight hundred sixty-nine thousand, three hundred ninety-three".