20708091 has 12 divisors (see below), whose sum is σ = 31671432. Its totient is φ = 12993216.

The previous prime is 20708021. The next prime is 20708099. The reversal of 20708091 is 19080702.

It is not a de Polignac number, because 20708091 - 2⁷ = 20707963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20708099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67521 + ... + 67826.

It is an arithmetic number, because the mean of its divisors is an integer number (2639286).

Almost surely, 2^20708091 is an apocalyptic number.

20708091 is a deficient number, since it is larger than the sum of its proper divisors (10963341).

20708091 is a wasteful number, since it uses less digits than its factorization.

20708091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135370 (or 135367 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 20708091 is about 4550.6143541285. The cubic root of 20708091 is about 274.6081073579.

Adding to 20708091 its reverse (19080702), we get a palindrome (39788793).

The spelling of 20708091 in words is "twenty million, seven hundred eight thousand, ninety-one".