20716313 has 2 divisors, whose sum is σ = 20716314. Its totient is φ = 20716312.

The previous prime is 20716301. The next prime is 20716343. The reversal of 20716313 is 31361702.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16999129 + 3717184 = 4123^2 + 1928^2 .

It is a cyclic number.

It is not a de Polignac number, because 20716313 - 2¹⁸ = 20454169 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20716343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10358156 + 10358157.

It is an arithmetic number, because the mean of its divisors is an integer number (10358157).

Almost surely, 2^20716313 is an apocalyptic number.

It is an amenable number.

20716313 is a deficient number, since it is larger than the sum of its proper divisors (1).

20716313 is an equidigital number, since it uses as much as digits as its factorization.

20716313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 20716313 is about 4551.5176589793. The cubic root of 20716313 is about 274.6444462798.

The spelling of 20716313 in words is "twenty million, seven hundred sixteen thousand, three hundred thirteen".