20367691 has 2 divisors, whose sum is σ = 20367692. Its totient is φ = 20367690.

The previous prime is 20367671. The next prime is 20367703. The reversal of 20367691 is 19676302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20367691 is a prime.

It is not a weakly prime, because it can be changed into another prime (20367671) 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, 10183845 + 10183846.

It is an arithmetic number, because the mean of its divisors is an integer number (10183846).

Almost surely, 2^20367691 is an apocalyptic number.

20367691 is a deficient number, since it is larger than the sum of its proper divisors (1).

20367691 is an equidigital number, since it uses as much as digits as its factorization.

20367691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 20367691 is about 4513.0578325565. The cubic root of 20367691 is about 273.0951155017.

The spelling of 20367691 in words is "twenty million, three hundred sixty-seven thousand, six hundred ninety-one".