20111243 has 2 divisors, whose sum is σ = 20111244. Its totient is φ = 20111242.

The previous prime is 20111213. The next prime is 20111257. The reversal of 20111243 is 34211102.

It is an a-pointer prime, because the next prime (20111257) can be obtained adding 20111243 to its sum of digits (14).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111243 is a prime.

It is not a weakly prime, because it can be changed into another prime (20111213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055621 + 10055622.

It is an arithmetic number, because the mean of its divisors is an integer number (10055622).

Almost surely, 2^20111243 is an apocalyptic number.

20111243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111243 is an equidigital number, since it uses as much as digits as its factorization.

20111243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 20111243 is about 4484.5560538363. The cubic root of 20111243 is about 271.9440980489.

Adding to 20111243 its reverse (34211102), we get a palindrome (54322345).

The spelling of 20111243 in words is "twenty million, one hundred eleven thousand, two hundred forty-three".