20708911 has 2 divisors, whose sum is σ = 20708912. Its totient is φ = 20708910.

The previous prime is 20708893. The next prime is 20708953. The reversal of 20708911 is 11980702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20708911 - 2⁹ = 20708399 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20708911.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20708971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10354455 + 10354456.

It is an arithmetic number, because the mean of its divisors is an integer number (10354456).

Almost surely, 2^20708911 is an apocalyptic number.

20708911 is a deficient number, since it is larger than the sum of its proper divisors (1).

20708911 is an equidigital number, since it uses as much as digits as its factorization.

20708911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 20708911 is about 4550.7044509614. The cubic root of 20708911 is about 274.6117319584.

The spelling of 20708911 in words is "twenty million, seven hundred eight thousand, nine hundred eleven".