20557303033 has 4 divisors (see below), whose sum is σ = 20558473380. Its totient is φ = 20556132688.

The previous prime is 20557303021. The next prime is 20557303087. The reversal of 20557303033 is 33030375502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33030375502 = 2 ⋅16515187751.

It can be written as a sum of positive squares in 2 ways, for example, as 9692993209 + 10864309824 = 98453^2 + 104232^2 .

It is a cyclic number.

It is not a de Polignac number, because 20557303033 - 2⁵ = 20557303001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20557302986 and 20557303004.

It is not an unprimeable number, because it can be changed into a prime (20557303093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558418 + ... + 594091.

It is an arithmetic number, because the mean of its divisors is an integer number (5139618345).

Almost surely, 2^20557303033 is an apocalyptic number.

It is an amenable number.

20557303033 is a deficient number, since it is larger than the sum of its proper divisors (1170347).

20557303033 is a wasteful number, since it uses less digits than its factorization.

20557303033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170346.

The product of its (nonzero) digits is 28350, while the sum is 31.

Adding to 20557303033 its reverse (33030375502), we get a palindrome (53587678535).

The spelling of 20557303033 in words is "twenty billion, five hundred fifty-seven million, three hundred three thousand, thirty-three".