20005903 has 2 divisors, whose sum is σ = 20005904. Its totient is φ = 20005902.

The previous prime is 20005891. The next prime is 20005907. The reversal of 20005903 is 30950002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20005903 - 2⁵ = 20005871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20005907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002951 + 10002952.

It is an arithmetic number, because the mean of its divisors is an integer number (10002952).

Almost surely, 2^20005903 is an apocalyptic number.

20005903 is a deficient number, since it is larger than the sum of its proper divisors (1).

20005903 is an equidigital number, since it uses as much as digits as its factorization.

20005903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 20005903 is about 4472.7958817724. The cubic root of 20005903 is about 271.4684643779.

Adding to 20005903 its reverse (30950002), we get a palindrome (50955905).

The spelling of 20005903 in words is "twenty million, five thousand, nine hundred three".