20908133 has 2 divisors, whose sum is σ = 20908134. Its totient is φ = 20908132.

The previous prime is 20908117. The next prime is 20908141. The reversal of 20908133 is 33180902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17156164 + 3751969 = 4142^2 + 1937^2 .

It is a cyclic number.

It is not a de Polignac number, because 20908133 - 2⁴ = 20908117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20908103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10454066 + 10454067.

It is an arithmetic number, because the mean of its divisors is an integer number (10454067).

Almost surely, 2^20908133 is an apocalyptic number.

It is an amenable number.

20908133 is a deficient number, since it is larger than the sum of its proper divisors (1).

20908133 is an equidigital number, since it uses as much as digits as its factorization.

20908133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 20908133 is about 4572.5411971900. The cubic root of 20908133 is about 275.4895214849.

The spelling of 20908133 in words is "twenty million, nine hundred eight thousand, one hundred thirty-three".