20315203 has 2 divisors, whose sum is σ = 20315204. Its totient is φ = 20315202.

The previous prime is 20315201. The next prime is 20315219. The reversal of 20315203 is 30251302.

It is an a-pointer prime, because the next prime (20315219) can be obtained adding 20315203 to its sum of digits (16).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20315203 - 2¹ = 20315201 is a prime.

Together with 20315201, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20315201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10157601 + 10157602.

It is an arithmetic number, because the mean of its divisors is an integer number (10157602).

Almost surely, 2^20315203 is an apocalyptic number.

20315203 is a deficient number, since it is larger than the sum of its proper divisors (1).

20315203 is an equidigital number, since it uses as much as digits as its factorization.

20315203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 20315203 is about 4507.2389552807. The cubic root of 20315203 is about 272.8603229360.

Adding to 20315203 its reverse (30251302), we get a palindrome (50566505).

The spelling of 20315203 in words is "twenty million, three hundred fifteen thousand, two hundred three".