20423423142231 has 4 divisors (see below), whose sum is σ = 27231230856312. Its totient is φ = 13615615428152.

The previous prime is 20423423142223. The next prime is 20423423142259. The reversal of 20423423142231 is 13224132432402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20423423142231 - 2³ = 20423423142223 is a prime.

It is a super-2 number, since 2×20423423142231² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20423423142192 and 20423423142201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423423142211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3403903857036 + ... + 3403903857041.

It is an arithmetic number, because the mean of its divisors is an integer number (6807807714078).

Almost surely, 2^{20423423142231} is an apocalyptic number.

20423423142231 is a deficient number, since it is larger than the sum of its proper divisors (6807807714081).

20423423142231 is an equidigital number, since it uses as much as digits as its factorization.

20423423142231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6807807714080.

The product of its (nonzero) digits is 55296, while the sum is 33.

Adding to 20423423142231 its reverse (13224132432402), we get a palindrome (33647555574633).

The spelling of 20423423142231 in words is "twenty trillion, four hundred twenty-three billion, four hundred twenty-three million, one hundred forty-two thousand, two hundred thirty-one".