20442240361 has 2 divisors, whose sum is σ = 20442240362. Its totient is φ = 20442240360.

The previous prime is 20442240349. The next prime is 20442240419. The reversal of 20442240361 is 16304224402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20215436761 + 226803600 = 142181^2 + 15060^2 .

It is a cyclic number.

It is not a de Polignac number, because 20442240361 - 2¹⁹ = 20441716073 is a prime.

It is not a weakly prime, because it can be changed into another prime (20442240661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221120180 + 10221120181.

It is an arithmetic number, because the mean of its divisors is an integer number (10221120181).

Almost surely, 2^20442240361 is an apocalyptic number.

It is an amenable number.

20442240361 is a deficient number, since it is larger than the sum of its proper divisors (1).

20442240361 is an equidigital number, since it uses as much as digits as its factorization.

20442240361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 20442240361 its reverse (16304224402), we get a palindrome (36746464763).

The spelling of 20442240361 in words is "twenty billion, four hundred forty-two million, two hundred forty thousand, three hundred sixty-one".