20005443131 has 4 divisors (see below), whose sum is σ = 20139708000. Its totient is φ = 19871178264.

The previous prime is 20005443091. The next prime is 20005443167. The reversal of 20005443131 is 13134450002.

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 20005443131 - 2¹⁴ = 20005426747 is a prime.

It is a super-2 number, since 2×20005443131² (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 = 20005443097 and 20005443106.

It is not an unprimeable number, because it can be changed into a prime (20005442131) 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, 67132211 + ... + 67132508.

It is an arithmetic number, because the mean of its divisors is an integer number (5034927000).

Almost surely, 2^20005443131 is an apocalyptic number.

20005443131 is a deficient number, since it is larger than the sum of its proper divisors (134264869).

20005443131 is a wasteful number, since it uses less digits than its factorization.

20005443131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134264868.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 20005443131 its reverse (13134450002), we get a palindrome (33139893133).

The spelling of 20005443131 in words is "twenty billion, five million, four hundred forty-three thousand, one hundred thirty-one".