20205530043131 has 2 divisors, whose sum is σ = 20205530043132. Its totient is φ = 20205530043130.

The previous prime is 20205530043067. The next prime is 20205530043133. The reversal of 20205530043131 is 13134003550202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20205530043131 - 2⁶ = 20205530043067 is a prime.

It is a super-2 number, since 2×20205530043131² (a number of 27 digits) contains 22 as substring.

Together with 20205530043133, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20205530043094 and 20205530043103.

It is not a weakly prime, because it can be changed into another prime (20205530043133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10102765021565 + 10102765021566.

It is an arithmetic number, because the mean of its divisors is an integer number (10102765021566).

Almost surely, 2^{20205530043131} is an apocalyptic number.

20205530043131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20205530043131 is an equidigital number, since it uses as much as digits as its factorization.

20205530043131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 20205530043131 its reverse (13134003550202), we get a palindrome (33339533593333).

The spelling of 20205530043131 in words is "twenty trillion, two hundred five billion, five hundred thirty million, forty-three thousand, one hundred thirty-one".