20608811 has 4 divisors (see below), whose sum is σ = 21821112. Its totient is φ = 19396512.

The previous prime is 20608801. The next prime is 20608813. The reversal of 20608811 is 11880602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20608811 - 2¹⁴ = 20592427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20608813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606125 + ... + 606158.

It is an arithmetic number, because the mean of its divisors is an integer number (5455278).

Almost surely, 2^20608811 is an apocalyptic number.

20608811 is a deficient number, since it is larger than the sum of its proper divisors (1212301).

20608811 is a wasteful number, since it uses less digits than its factorization.

20608811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212300.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 20608811 is about 4539.6928310184. The cubic root of 20608811 is about 274.1685564900.

The spelling of 20608811 in words is "twenty million, six hundred eight thousand, eight hundred eleven".