20811033 has 16 divisors (see below), whose sum is σ = 31415040. Its totient is φ = 13611312.

The previous prime is 20811031. The next prime is 20811041. The reversal of 20811033 is 33011802.

It is not a de Polignac number, because 20811033 - 2¹ = 20811031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20810997 and 20811015.

It is not an unprimeable number, because it can be changed into a prime (20811031) 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 15 ways as a sum of consecutive naturals, for example, 5841 + ... + 8702.

It is an arithmetic number, because the mean of its divisors is an integer number (1963440).

Almost surely, 2^20811033 is an apocalyptic number.

It is an amenable number.

20811033 is a deficient number, since it is larger than the sum of its proper divisors (10604007).

20811033 is a wasteful number, since it uses less digits than its factorization.

20811033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14605 (or 14599 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20811033 is about 4561.9111126807. The cubic root of 20811033 is about 275.0623902519.

Adding to 20811033 its reverse (33011802), we get a palindrome (53822835).

The spelling of 20811033 in words is "twenty million, eight hundred eleven thousand, thirty-three".