20442402397 has 2 divisors, whose sum is σ = 20442402398. Its totient is φ = 20442402396.

The previous prime is 20442402371. The next prime is 20442402433. The reversal of 20442402397 is 79320424402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20418695236 + 23707161 = 142894^2 + 4869^2 .

It is a cyclic number.

It is not a de Polignac number, because 20442402397 - 2¹⁹ = 20441878109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20442402307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221201198 + 10221201199.

It is an arithmetic number, because the mean of its divisors is an integer number (10221201199).

Almost surely, 2^20442402397 is an apocalyptic number.

It is an amenable number.

20442402397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20442402397 is an equidigital number, since it uses as much as digits as its factorization.

20442402397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 37.

Adding to 20442402397 its reverse (79320424402), we get a palindrome (99762826799).

The spelling of 20442402397 in words is "twenty billion, four hundred forty-two million, four hundred two thousand, three hundred ninety-seven".