20195243 has 2 divisors, whose sum is σ = 20195244. Its totient is φ = 20195242.

The previous prime is 20195221. The next prime is 20195249. The reversal of 20195243 is 34259102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20195243 - 2⁶ = 20195179 is a prime.

It is a zygodrome in base 7.

It is not a weakly prime, because it can be changed into another prime (20195249) 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, 10097621 + 10097622.

It is an arithmetic number, because the mean of its divisors is an integer number (10097622).

Almost surely, 2^20195243 is an apocalyptic number.

20195243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20195243 is an equidigital number, since it uses as much as digits as its factorization.

20195243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20195243 is about 4493.9117703845. The cubic root of 20195243 is about 272.3221879578.

The spelling of 20195243 in words is "twenty million, one hundred ninety-five thousand, two hundred forty-three".