20400143171 has 2 divisors, whose sum is σ = 20400143172. Its totient is φ = 20400143170.

The previous prime is 20400143129. The next prime is 20400143189. The reversal of 20400143171 is 17134100402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20400143171 is a prime.

It is not a weakly prime, because it can be changed into another prime (20400113171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200071585 + 10200071586.

It is an arithmetic number, because the mean of its divisors is an integer number (10200071586).

Almost surely, 2^20400143171 is an apocalyptic number.

20400143171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400143171 is an equidigital number, since it uses as much as digits as its factorization.

20400143171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

Adding to 20400143171 its reverse (17134100402), we get a palindrome (37534243573).

The spelling of 20400143171 in words is "twenty billion, four hundred million, one hundred forty-three thousand, one hundred seventy-one".