20873393 has 2 divisors, whose sum is σ = 20873394. Its totient is φ = 20873392.

The previous prime is 20873389. The next prime is 20873423. The reversal of 20873393 is 39337802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12306064 + 8567329 = 3508^2 + 2927^2 .

It is a cyclic number.

It is not a de Polignac number, because 20873393 - 2² = 20873389 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20873893) 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, 10436696 + 10436697.

It is an arithmetic number, because the mean of its divisors is an integer number (10436697).

Almost surely, 2^20873393 is an apocalyptic number.

It is an amenable number.

20873393 is a deficient number, since it is larger than the sum of its proper divisors (1).

20873393 is an equidigital number, since it uses as much as digits as its factorization.

20873393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 20873393 is about 4568.7408549840. The cubic root of 20873393 is about 275.3368566261.

The spelling of 20873393 in words is "twenty million, eight hundred seventy-three thousand, three hundred ninety-three".