20316577 has 2 divisors, whose sum is σ = 20316578. Its totient is φ = 20316576.

The previous prime is 20316551. The next prime is 20316587. The reversal of 20316577 is 77561302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18584721 + 1731856 = 4311^2 + 1316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20316577 is a prime.

It is not a weakly prime, because it can be changed into another prime (20316587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10158288 + 10158289.

It is an arithmetic number, because the mean of its divisors is an integer number (10158289).

Almost surely, 2^20316577 is an apocalyptic number.

It is an amenable number.

20316577 is a deficient number, since it is larger than the sum of its proper divisors (1).

20316577 is an equidigital number, since it uses as much as digits as its factorization.

20316577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 20316577 is about 4507.3913741764. The cubic root of 20316577 is about 272.8664743494.

Adding to 20316577 its reverse (77561302), we get a palindrome (97877879).

The spelling of 20316577 in words is "twenty million, three hundred sixteen thousand, five hundred seventy-seven".