20563442401 has 2 divisors, whose sum is σ = 20563442402. Its totient is φ = 20563442400.

The previous prime is 20563442377. The next prime is 20563442407. The reversal of 20563442401 is 10424436502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20492208801 + 71233600 = 143151^2 + 8440^2 .

It is a cyclic number.

It is not a de Polignac number, because 20563442401 - 2¹¹ = 20563440353 is a prime.

It is not a weakly prime, because it can be changed into another prime (20563442407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10281721200 + 10281721201.

It is an arithmetic number, because the mean of its divisors is an integer number (10281721201).

Almost surely, 2^20563442401 is an apocalyptic number.

It is an amenable number.

20563442401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20563442401 is an equidigital number, since it uses as much as digits as its factorization.

20563442401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 20563442401 its reverse (10424436502), we get a palindrome (30987878903).

The spelling of 20563442401 in words is "twenty billion, five hundred sixty-three million, four hundred forty-two thousand, four hundred one".