20305003 has 2 divisors, whose sum is σ = 20305004. Its totient is φ = 20305002.

The previous prime is 20304997. The next prime is 20305013. The reversal of 20305003 is 30050302.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20305003 is a prime.

It is not a weakly prime, because it can be changed into another prime (20305013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10152501 + 10152502.

It is an arithmetic number, because the mean of its divisors is an integer number (10152502).

Almost surely, 2^20305003 is an apocalyptic number.

20305003 is a deficient number, since it is larger than the sum of its proper divisors (1).

20305003 is an equidigital number, since it uses as much as digits as its factorization.

20305003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 13.

The square root of 20305003 is about 4506.1073000984. The cubic root of 20305003 is about 272.8146487477.

Adding to 20305003 its reverse (30050302), we get a palindrome (50355305).

The spelling of 20305003 in words is "twenty million, three hundred five thousand, three".