20905571233 has 4 divisors (see below), whose sum is σ = 21108538048. Its totient is φ = 20702604420.

The previous prime is 20905571231. The next prime is 20905571261. The reversal of 20905571233 is 33217550902.

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.

It is a cyclic number.

It is not a de Polignac number, because 20905571233 - 2¹ = 20905571231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20905571192 and 20905571201.

It is not an unprimeable number, because it can be changed into a prime (20905571231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101483253 + ... + 101483458.

It is an arithmetic number, because the mean of its divisors is an integer number (5277134512).

Almost surely, 2^20905571233 is an apocalyptic number.

It is an amenable number.

20905571233 is a deficient number, since it is larger than the sum of its proper divisors (202966815).

20905571233 is a wasteful number, since it uses less digits than its factorization.

20905571233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202966814.

The product of its (nonzero) digits is 56700, while the sum is 37.

The spelling of 20905571233 in words is "twenty billion, nine hundred five million, five hundred seventy-one thousand, two hundred thirty-three".