20531033 has 4 divisors (see below), whose sum is σ = 20540688. Its totient is φ = 20521380.

The previous prime is 20531023. The next prime is 20531059. The reversal of 20531033 is 33013502.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 33013502 = 2 ⋅16506751.

It is a cyclic number.

It is not a de Polignac number, because 20531033 - 2⁶ = 20530969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20531023) 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, 83 + ... + 6408.

It is an arithmetic number, because the mean of its divisors is an integer number (5135172).

Almost surely, 2^20531033 is an apocalyptic number.

It is an amenable number.

20531033 is a deficient number, since it is larger than the sum of its proper divisors (9655).

20531033 is an equidigital number, since it uses as much as digits as its factorization.

20531033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9654.

The product of its (nonzero) digits is 270, while the sum is 17.

The square root of 20531033 is about 4531.1182946376. The cubic root of 20531033 is about 273.8232161007.

Adding to 20531033 its reverse (33013502), we get a palindrome (53544535).

The spelling of 20531033 in words is "twenty million, five hundred thirty-one thousand, thirty-three".