20404171243 has 2 divisors, whose sum is σ = 20404171244. Its totient is φ = 20404171242.

The previous prime is 20404171237. The next prime is 20404171247. The reversal of 20404171243 is 34217140402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20404171243 - 2⁵ = 20404171211 is a prime.

It is a super-2 number, since 2×20404171243² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20404171247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202085621 + 10202085622.

It is an arithmetic number, because the mean of its divisors is an integer number (10202085622).

Almost surely, 2^20404171243 is an apocalyptic number.

20404171243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404171243 is an equidigital number, since it uses as much as digits as its factorization.

20404171243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 28.

The spelling of 20404171243 in words is "twenty billion, four hundred four million, one hundred seventy-one thousand, two hundred forty-three".