20423445404231 has 2 divisors, whose sum is σ = 20423445404232. Its totient is φ = 20423445404230.

The previous prime is 20423445404207. The next prime is 20423445404267. The reversal of 20423445404231 is 13240454432402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20423445404231 - 2³⁸ = 20148567497287 is a prime.

It is a super-2 number, since 2×20423445404231² (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 (20423445404431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211722702115 + 10211722702116.

It is an arithmetic number, because the mean of its divisors is an integer number (10211722702116).

Almost surely, 2^{20423445404231} is an apocalyptic number.

20423445404231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20423445404231 is an equidigital number, since it uses as much as digits as its factorization.

20423445404231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 368640, while the sum is 38.

Adding to 20423445404231 its reverse (13240454432402), we get a palindrome (33663899836633).

The spelling of 20423445404231 in words is "twenty trillion, four hundred twenty-three billion, four hundred forty-five million, four hundred four thousand, two hundred thirty-one".