20371513 has 2 divisors, whose sum is σ = 20371514. Its totient is φ = 20371512.

The previous prime is 20371501. The next prime is 20371517. The reversal of 20371513 is 31517302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18766224 + 1605289 = 4332^2 + 1267^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20371513 is a prime.

It is not a weakly prime, because it can be changed into another prime (20371517) 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, 10185756 + 10185757.

It is an arithmetic number, because the mean of its divisors is an integer number (10185757).

Almost surely, 2^20371513 is an apocalyptic number.

It is an amenable number.

20371513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20371513 is an equidigital number, since it uses as much as digits as its factorization.

20371513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 20371513 is about 4513.4812506534. The cubic root of 20371513 is about 273.1121965452.

Adding to 20371513 its reverse (31517302), we get a palindrome (51888815).

The spelling of 20371513 in words is "twenty million, three hundred seventy-one thousand, five hundred thirteen".