20306903 has 2 divisors, whose sum is σ = 20306904. Its totient is φ = 20306902.

The previous prime is 20306887. The next prime is 20306911. The reversal of 20306903 is 30960302.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20306903 - 2⁴ = 20306887 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20306203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10153451 + 10153452.

It is an arithmetic number, because the mean of its divisors is an integer number (10153452).

Almost surely, 2^20306903 is an apocalyptic number.

20306903 is a deficient number, since it is larger than the sum of its proper divisors (1).

20306903 is an equidigital number, since it uses as much as digits as its factorization.

20306903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 20306903 is about 4506.3181201509. The cubic root of 20306903 is about 272.8231578438.

The spelling of 20306903 in words is "twenty million, three hundred six thousand, nine hundred three".