20001320243 has 2 divisors, whose sum is σ = 20001320244. Its totient is φ = 20001320242.

The previous prime is 20001320149. The next prime is 20001320279. The reversal of 20001320243 is 34202310002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20001320243 - 2¹⁴ = 20001303859 is a prime.

It is a super-2 number, since 2×20001320243² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20001020243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000660121 + 10000660122.

It is an arithmetic number, because the mean of its divisors is an integer number (10000660122).

Almost surely, 2^20001320243 is an apocalyptic number.

20001320243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001320243 is an equidigital number, since it uses as much as digits as its factorization.

20001320243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 20001320243 its reverse (34202310002), we get a palindrome (54203630245).

The spelling of 20001320243 in words is "twenty billion, one million, three hundred twenty thousand, two hundred forty-three".