20680903 has 2 divisors, whose sum is σ = 20680904. Its totient is φ = 20680902.

The previous prime is 20680901. The next prime is 20680927. The reversal of 20680903 is 30908602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20680903 - 2¹ = 20680901 is a prime.

Together with 20680901, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20680901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10340451 + 10340452.

It is an arithmetic number, because the mean of its divisors is an integer number (10340452).

Almost surely, 2^20680903 is an apocalyptic number.

20680903 is a deficient number, since it is larger than the sum of its proper divisors (1).

20680903 is an equidigital number, since it uses as much as digits as its factorization.

20680903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 20680903 is about 4547.6260840135. The cubic root of 20680903 is about 274.4878755277.

The spelling of 20680903 in words is "twenty million, six hundred eighty thousand, nine hundred three".