20315201 has 2 divisors, whose sum is σ = 20315202. Its totient is φ = 20315200.

The previous prime is 20315189. The next prime is 20315203. The reversal of 20315201 is 10251302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18490000 + 1825201 = 4300^2 + 1351^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20315201 is a prime.

Together with 20315203, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20315203) 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, 10157600 + 10157601.

It is an arithmetic number, because the mean of its divisors is an integer number (10157601).

Almost surely, 2^20315201 is an apocalyptic number.

It is an amenable number.

20315201 is a deficient number, since it is larger than the sum of its proper divisors (1).

20315201 is an equidigital number, since it uses as much as digits as its factorization.

20315201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 20315201 is about 4507.2387334154. The cubic root of 20315201 is about 272.8603139818.

Adding to 20315201 its reverse (10251302), we get a palindrome (30566503).

It can be divided in two parts, 203 and 15201, that multiplied together give a palindrome (3085803).

The spelling of 20315201 in words is "twenty million, three hundred fifteen thousand, two hundred one".