20535450533 has 4 divisors (see below), whose sum is σ = 22115100588. Its totient is φ = 18955800480.

The previous prime is 20535450521. The next prime is 20535450541. The reversal of 20535450533 is 33505453502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33505453502 = 2 ⋅16752726751.

It can be written as a sum of positive squares in 2 ways, for example, as 11529820129 + 9005630404 = 107377^2 + 94898^2 .

It is a cyclic number.

It is not a de Polignac number, because 20535450533 - 2²⁰ = 20534401957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20535450493 and 20535450502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20535450503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 789825008 + ... + 789825033.

It is an arithmetic number, because the mean of its divisors is an integer number (5528775147).

Almost surely, 2^20535450533 is an apocalyptic number.

It is an amenable number.

20535450533 is a deficient number, since it is larger than the sum of its proper divisors (1579650055).

20535450533 is a wasteful number, since it uses less digits than its factorization.

20535450533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1579650054.

The product of its (nonzero) digits is 135000, while the sum is 35.

The spelling of 20535450533 in words is "twenty billion, five hundred thirty-five million, four hundred fifty thousand, five hundred thirty-three".