20520133 has 4 divisors (see below), whose sum is σ = 21600160. Its totient is φ = 19440108.

The previous prime is 20520103. The next prime is 20520161. The reversal of 20520133 is 33102502.

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 a de Polignac number, because none of the positive numbers 2^k-20520133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 539985 + ... + 540022.

It is an arithmetic number, because the mean of its divisors is an integer number (5400040).

Almost surely, 2^20520133 is an apocalyptic number.

It is an amenable number.

20520133 is a deficient number, since it is larger than the sum of its proper divisors (1080027).

20520133 is a wasteful number, since it uses less digits than its factorization.

20520133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080026.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 20520133 is about 4529.9153413723. The cubic root of 20520133 is about 273.7747496093.

Adding to 20520133 its reverse (33102502), we get a palindrome (53622635).

The spelling of 20520133 in words is "twenty million, five hundred twenty thousand, one hundred thirty-three".