20908099 has 2 divisors, whose sum is σ = 20908100. Its totient is φ = 20908098.

The previous prime is 20908021. The next prime is 20908103. The reversal of 20908099 is 99080902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20908099 - 2¹¹ = 20906051 is a prime.

It is not a weakly prime, because it can be changed into another prime (20908399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10454049 + 10454050.

It is an arithmetic number, because the mean of its divisors is an integer number (10454050).

Almost surely, 2^20908099 is an apocalyptic number.

20908099 is a deficient number, since it is larger than the sum of its proper divisors (1).

20908099 is an equidigital number, since it uses as much as digits as its factorization.

20908099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 20908099 is about 4572.5374793434. The cubic root of 20908099 is about 275.4893721547.

The spelling of 20908099 in words is "twenty million, nine hundred eight thousand, ninety-nine".