20531131333 has 4 divisors (see below), whose sum is σ = 20542470048. Its totient is φ = 20519792620.

The previous prime is 20531131331. The next prime is 20531131349. The reversal of 20531131333 is 33313113502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33313113502 = 2 ⋅16656556751.

It is a cyclic number.

It is not a de Polignac number, because 20531131333 - 2¹ = 20531131331 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20531131298 and 20531131307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531131331) 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, 5666641 + ... + 5670262.

It is an arithmetic number, because the mean of its divisors is an integer number (5135617512).

Almost surely, 2^20531131333 is an apocalyptic number.

It is an amenable number.

20531131333 is a deficient number, since it is larger than the sum of its proper divisors (11338715).

20531131333 is a wasteful number, since it uses less digits than its factorization.

20531131333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11338714.

The product of its (nonzero) digits is 2430, while the sum is 25.

Adding to 20531131333 its reverse (33313113502), we get a palindrome (53844244835).

The spelling of 20531131333 in words is "twenty billion, five hundred thirty-one million, one hundred thirty-one thousand, three hundred thirty-three".