20287313 has 2 divisors, whose sum is σ = 20287314. Its totient is φ = 20287312.

The previous prime is 20287301. The next prime is 20287343. The reversal of 20287313 is 31378202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15499969 + 4787344 = 3937^2 + 2188^2 .

It is a cyclic number.

It is not a de Polignac number, because 20287313 - 2⁴ = 20287297 is a prime.

It is not a weakly prime, because it can be changed into another prime (20287343) 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, 10143656 + 10143657.

It is an arithmetic number, because the mean of its divisors is an integer number (10143657).

Almost surely, 2^20287313 is an apocalyptic number.

It is an amenable number.

20287313 is a deficient number, since it is larger than the sum of its proper divisors (1).

20287313 is an equidigital number, since it uses as much as digits as its factorization.

20287313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20287313 is about 4504.1439808248. The cubic root of 20287313 is about 272.7353990946.

The spelling of 20287313 in words is "twenty million, two hundred eighty-seven thousand, three hundred thirteen".