20993339 has 2 divisors, whose sum is σ = 20993340. Its totient is φ = 20993338.

The previous prime is 20993281. The next prime is 20993359. The reversal of 20993339 is 93339902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20993339 - 2⁸ = 20993083 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20993359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10496669 + 10496670.

It is an arithmetic number, because the mean of its divisors is an integer number (10496670).

Almost surely, 2^20993339 is an apocalyptic number.

20993339 is a deficient number, since it is larger than the sum of its proper divisors (1).

20993339 is an equidigital number, since it uses as much as digits as its factorization.

20993339 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39366, while the sum is 38.

The square root of 20993339 is about 4581.8488626318. The cubic root of 20993339 is about 275.8632444043.

The spelling of 20993339 in words is "twenty million, nine hundred ninety-three thousand, three hundred thirty-nine".