20310257243 has 4 divisors (see below), whose sum is σ = 20319055680. Its totient is φ = 20301458808.

The previous prime is 20310257179. The next prime is 20310257293. The reversal of 20310257243 is 34275201302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34275201302 = 2 ⋅17137600651.

It is a cyclic number.

It is not a de Polignac number, because 20310257243 - 2⁶ = 20310257179 is a prime.

It is a super-2 number, since 2×20310257243² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20310257293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4395755 + ... + 4400372.

It is an arithmetic number, because the mean of its divisors is an integer number (5079763920).

Almost surely, 2^20310257243 is an apocalyptic number.

20310257243 is a deficient number, since it is larger than the sum of its proper divisors (8798437).

20310257243 is an equidigital number, since it uses as much as digits as its factorization.

20310257243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8798436.

The product of its (nonzero) digits is 10080, while the sum is 29.

Adding to 20310257243 its reverse (34275201302), we get a palindrome (54585458545).

The spelling of 20310257243 in words is "twenty billion, three hundred ten million, two hundred fifty-seven thousand, two hundred forty-three".