20405340341 has 2 divisors, whose sum is σ = 20405340342. Its totient is φ = 20405340340.

The previous prime is 20405340299. The next prime is 20405340379. The reversal of 20405340341 is 14304350402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13673794225 + 6731546116 = 116935^2 + 82046^2 .

It is a cyclic number.

It is not a de Polignac number, because 20405340341 - 2³⁴ = 3225471157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20405340341.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20405340391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202670170 + 10202670171.

It is an arithmetic number, because the mean of its divisors is an integer number (10202670171).

Almost surely, 2^20405340341 is an apocalyptic number.

It is an amenable number.

20405340341 is a deficient number, since it is larger than the sum of its proper divisors (1).

20405340341 is an equidigital number, since it uses as much as digits as its factorization.

20405340341 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 20405340341 its reverse (14304350402), we get a palindrome (34709690743).

The spelling of 20405340341 in words is "twenty billion, four hundred five million, three hundred forty thousand, three hundred forty-one".