20669339 has 2 divisors, whose sum is σ = 20669340. Its totient is φ = 20669338.

The previous prime is 20669317. The next prime is 20669357. The reversal of 20669339 is 93396602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20669339 - 2¹² = 20665243 is a prime.

It is not a weakly prime, because it can be changed into another prime (20669039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10334669 + 10334670.

It is an arithmetic number, because the mean of its divisors is an integer number (10334670).

Almost surely, 2^20669339 is an apocalyptic number.

20669339 is a deficient number, since it is larger than the sum of its proper divisors (1).

20669339 is an equidigital number, since it uses as much as digits as its factorization.

20669339 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 38.

The square root of 20669339 is about 4546.3544736415. The cubic root of 20669339 is about 274.4367048155.

The spelling of 20669339 in words is "twenty million, six hundred sixty-nine thousand, three hundred thirty-nine".