20402440241 has 2 divisors, whose sum is σ = 20402440242. Its totient is φ = 20402440240.

The previous prime is 20402440199. The next prime is 20402440243. The reversal of 20402440241 is 14204420402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11590675600 + 8811764641 = 107660^2 + 93871^2 .

It is a cyclic number.

It is not a de Polignac number, because 20402440241 - 2²⁶ = 20335331377 is a prime.

It is a super-2 number, since 2×20402440241² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 20402440243, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20402440243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201220120 + 10201220121.

It is an arithmetic number, because the mean of its divisors is an integer number (10201220121).

Almost surely, 2^20402440241 is an apocalyptic number.

It is an amenable number.

20402440241 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402440241 is an equidigital number, since it uses as much as digits as its factorization.

20402440241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 20402440241 its reverse (14204420402), we get a palindrome (34606860643).

The spelling of 20402440241 in words is "twenty billion, four hundred two million, four hundred forty thousand, two hundred forty-one".