20533113311 has 6 divisors (see below), whose sum is σ = 21464672880. Its totient is φ = 19640368748.

The previous prime is 20533113269. The next prime is 20533113319. The reversal of 20533113311 is 11331133502.

It is not a de Polignac number, because 20533113311 - 2¹⁰ = 20533112287 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20533113319) 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 5 ways as a sum of consecutive naturals, for example, 19406951 + ... + 19408008.

It is an arithmetic number, because the mean of its divisors is an integer number (3577445480).

Almost surely, 2^20533113311 is an apocalyptic number.

20533113311 is a deficient number, since it is larger than the sum of its proper divisors (931559569).

20533113311 is an equidigital number, since it uses as much as digits as its factorization.

20533113311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38815005 (or 38814982 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 23.

Adding to 20533113311 its reverse (11331133502), we get a palindrome (31864246813).

The spelling of 20533113311 in words is "twenty billion, five hundred thirty-three million, one hundred thirteen thousand, three hundred eleven".