20203243 has 2 divisors, whose sum is σ = 20203244. Its totient is φ = 20203242.

The previous prime is 20203237. The next prime is 20203273. The reversal of 20203243 is 34230202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20203243 - 2²¹ = 18106091 is a prime.

It is not a weakly prime, because it can be changed into another prime (20203273) 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, 10101621 + 10101622.

It is an arithmetic number, because the mean of its divisors is an integer number (10101622).

Almost surely, 2^20203243 is an apocalyptic number.

20203243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20203243 is an equidigital number, since it uses as much as digits as its factorization.

20203243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 20203243 is about 4494.8017753845. The cubic root of 20203243 is about 272.3581418026.

Adding to 20203243 its reverse (34230202), we get a palindrome (54433445).

The spelling of 20203243 in words is "twenty million, two hundred three thousand, two hundred forty-three".