20404244243 has 2 divisors, whose sum is σ = 20404244244. Its totient is φ = 20404244242.

The previous prime is 20404244177. The next prime is 20404244261. The reversal of 20404244243 is 34244240402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20404244243 is a prime.

It is not a weakly prime, because it can be changed into another prime (20404244293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202122121 + 10202122122.

It is an arithmetic number, because the mean of its divisors is an integer number (10202122122).

Almost surely, 2^20404244243 is an apocalyptic number.

20404244243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404244243 is an equidigital number, since it uses as much as digits as its factorization.

20404244243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24576, while the sum is 29.

Adding to 20404244243 its reverse (34244240402), we get a palindrome (54648484645).

The spelling of 20404244243 in words is "twenty billion, four hundred four million, two hundred forty-four thousand, two hundred forty-three".