20400441255533 has 2 divisors, whose sum is σ = 20400441255534. Its totient is φ = 20400441255532.

The previous prime is 20400441255517. The next prime is 20400441255539. The reversal of 20400441255533 is 33555214400402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16560887223049 + 3839554032484 = 4069507^2 + 1959478^2 .

It is a cyclic number.

It is not a de Polignac number, because 20400441255533 - 2⁴ = 20400441255517 is a prime.

It is a super-2 number, since 2×20400441255533² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20400441255539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200220627766 + 10200220627767.

It is an arithmetic number, because the mean of its divisors is an integer number (10200220627767).

Almost surely, 2^{20400441255533} is an apocalyptic number.

It is an amenable number.

20400441255533 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400441255533 is an equidigital number, since it uses as much as digits as its factorization.

20400441255533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288000, while the sum is 38.

Adding to 20400441255533 its reverse (33555214400402), we get a palindrome (53955655655935).

The spelling of 20400441255533 in words is "twenty trillion, four hundred billion, four hundred forty-one million, two hundred fifty-five thousand, five hundred thirty-three".