20917133 has 2 divisors, whose sum is σ = 20917134. Its totient is φ = 20917132.

The previous prime is 20917129. The next prime is 20917153. The reversal of 20917133 is 33171902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18088009 + 2829124 = 4253^2 + 1682^2 .

It is a cyclic number.

It is not a de Polignac number, because 20917133 - 2² = 20917129 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20917153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10458566 + 10458567.

It is an arithmetic number, because the mean of its divisors is an integer number (10458567).

Almost surely, 2^20917133 is an apocalyptic number.

It is an amenable number.

20917133 is a deficient number, since it is larger than the sum of its proper divisors (1).

20917133 is an equidigital number, since it uses as much as digits as its factorization.

20917133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 20917133 is about 4573.5252267808. The cubic root of 20917133 is about 275.5290443829.

The spelling of 20917133 in words is "twenty million, nine hundred seventeen thousand, one hundred thirty-three".