20535222031 has 4 divisors (see below), whose sum is σ = 20542264792. Its totient is φ = 20528179272.

The previous prime is 20535222023. The next prime is 20535222047. The reversal of 20535222031 is 13022253502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13022253502 = 2 ⋅6511126751.

It is a cyclic number.

It is not a de Polignac number, because 20535222031 - 2³ = 20535222023 is a prime.

It is a super-2 number, since 2×20535222031² (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 = 20535221987 and 20535222005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20535222011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3517005 + ... + 3522838.

It is an arithmetic number, because the mean of its divisors is an integer number (5135566198).

Almost surely, 2^20535222031 is an apocalyptic number.

20535222031 is a deficient number, since it is larger than the sum of its proper divisors (7042761).

20535222031 is an equidigital number, since it uses as much as digits as its factorization.

20535222031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7042760.

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 20535222031 its reverse (13022253502), we get a palindrome (33557475533).

The spelling of 20535222031 in words is "twenty billion, five hundred thirty-five million, two hundred twenty-two thousand, thirty-one".