20243310397 has 4 divisors (see below), whose sum is σ = 20397839616. Its totient is φ = 20088781180.

The previous prime is 20243310377. The next prime is 20243310407. The reversal of 20243310397 is 79301334202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79301334202 = 2 ⋅39650667101.

It is a cyclic number.

It is not a de Polignac number, because 20243310397 - 2²⁷ = 20109092669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20243310317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77264413 + ... + 77264674.

It is an arithmetic number, because the mean of its divisors is an integer number (5099459904).

Almost surely, 2^20243310397 is an apocalyptic number.

It is an amenable number.

20243310397 is a deficient number, since it is larger than the sum of its proper divisors (154529219).

20243310397 is a wasteful number, since it uses less digits than its factorization.

20243310397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154529218.

The product of its (nonzero) digits is 27216, while the sum is 34.

Adding to 20243310397 its reverse (79301334202), we get a palindrome (99544644599).

The spelling of 20243310397 in words is "twenty billion, two hundred forty-three million, three hundred ten thousand, three hundred ninety-seven".