20533013 has 4 divisors (see below), whose sum is σ = 20587008. Its totient is φ = 20479020.

The previous prime is 20533001. The next prime is 20533049. The reversal of 20533013 is 31033502.

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 an emirpimes, since its reverse is a distinct semiprime: 31033502 = 2 ⋅15516751.

It is a cyclic number.

It is not a de Polignac number, because 20533013 - 2⁶ = 20532949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20532982 and 20533000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20533063) 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, 26423 + ... + 27188.

It is an arithmetic number, because the mean of its divisors is an integer number (5146752).

Almost surely, 2^20533013 is an apocalyptic number.

It is an amenable number.

20533013 is a deficient number, since it is larger than the sum of its proper divisors (53995).

20533013 is an equidigital number, since it uses as much as digits as its factorization.

20533013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53994.

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

The square root of 20533013 is about 4531.3367784794. The cubic root of 20533013 is about 273.8320182644.

Adding to 20533013 its reverse (31033502), we get a palindrome (51566515).

The spelling of 20533013 in words is "twenty million, five hundred thirty-three thousand, thirteen".