20423544131 has 4 divisors (see below), whose sum is σ = 20423830752. Its totient is φ = 20423257512.

The previous prime is 20423544107. The next prime is 20423544137. The reversal of 20423544131 is 13144532402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20423544131 - 2³⁴ = 3243674947 is a prime.

It is a super-2 number, since 2×20423544131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20423544094 and 20423544103.

It is not an unprimeable number, because it can be changed into a prime (20423544137) 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, 55625 + ... + 209621.

It is an arithmetic number, because the mean of its divisors is an integer number (5105957688).

Almost surely, 2^20423544131 is an apocalyptic number.

20423544131 is a deficient number, since it is larger than the sum of its proper divisors (286621).

20423544131 is a wasteful number, since it uses less digits than its factorization.

20423544131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286620.

The product of its (nonzero) digits is 11520, while the sum is 29.

The spelling of 20423544131 in words is "twenty billion, four hundred twenty-three million, five hundred forty-four thousand, one hundred thirty-one".