20404563200881 has 2 divisors, whose sum is σ = 20404563200882. Its totient is φ = 20404563200880.

The previous prime is 20404563200873. The next prime is 20404563200921. The reversal of 20404563200881 is 18800236540402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13754307342400 + 6650255858481 = 3708680^2 + 2578809^2 .

It is a cyclic number.

It is not a de Polignac number, because 20404563200881 - 2³ = 20404563200873 is a prime.

It is a super-2 number, since 2×20404563200881² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20404563203881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202281600440 + 10202281600441.

It is an arithmetic number, because the mean of its divisors is an integer number (10202281600441).

Almost surely, 2^{20404563200881} is an apocalyptic number.

It is an amenable number.

20404563200881 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404563200881 is an equidigital number, since it uses as much as digits as its factorization.

20404563200881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 368640, while the sum is 43.

The spelling of 20404563200881 in words is "twenty trillion, four hundred four billion, five hundred sixty-three million, two hundred thousand, eight hundred eighty-one".