20316761 has 2 divisors, whose sum is σ = 20316762. Its totient is φ = 20316760.

The previous prime is 20316713. The next prime is 20316767. The reversal of 20316761 is 16761302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19193161 + 1123600 = 4381^2 + 1060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20316761 is a prime.

It is a super-2 number, since 2×20316761² = 825541555062242, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20316761.

It is not a weakly prime, because it can be changed into another prime (20316767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10158380 + 10158381.

It is an arithmetic number, because the mean of its divisors is an integer number (10158381).

Almost surely, 2^20316761 is an apocalyptic number.

It is an amenable number.

20316761 is a deficient number, since it is larger than the sum of its proper divisors (1).

20316761 is an equidigital number, since it uses as much as digits as its factorization.

20316761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20316761 is about 4507.4117850492. The cubic root of 20316761 is about 272.8672980983.

The spelling of 20316761 in words is "twenty million, three hundred sixteen thousand, seven hundred sixty-one".