20656011 has 4 divisors (see below), whose sum is σ = 27541352. Its totient is φ = 13770672.

The previous prime is 20655997. The next prime is 20656057. The reversal of 20656011 is 11065602.

It is a happy number.

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

It is not a de Polignac number, because 20656011 - 2¹⁵ = 20623243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20656081) 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, 3442666 + ... + 3442671.

It is an arithmetic number, because the mean of its divisors is an integer number (6885338).

Almost surely, 2^20656011 is an apocalyptic number.

20656011 is a deficient number, since it is larger than the sum of its proper divisors (6885341).

20656011 is an equidigital number, since it uses as much as digits as its factorization.

20656011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6885340.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20656011 is about 4544.8884474759. Note that the first 3 decimals coincide. The cubic root of 20656011 is about 274.3777047210.

It can be divided in two parts, 2065601 and 1, that added together give a palindrome (2065602).

The spelling of 20656011 in words is "twenty million, six hundred fifty-six thousand, eleven".