20555011 has 4 divisors (see below), whose sum is σ = 20579800. Its totient is φ = 20530224.

The previous prime is 20555009. The next prime is 20555071. The reversal of 20555011 is 11055502.

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 20555011 - 2¹ = 20555009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20555011.

It is not an unprimeable number, because it can be changed into a prime (20555071) 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 in 3 ways as a sum of consecutive naturals, for example, 11106 + ... + 12823.

It is an arithmetic number, because the mean of its divisors is an integer number (5144950).

Almost surely, 2^20555011 is an apocalyptic number.

20555011 is a deficient number, since it is larger than the sum of its proper divisors (24789).

20555011 is an equidigital number, since it uses as much as digits as its factorization.

20555011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24788.

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 20555011 is about 4533.7634477330. The cubic root of 20555011 is about 273.9297731472.

It can be divided in two parts, 2055501 and 1, that added together give a palindrome (2055502).

The spelling of 20555011 in words is "twenty million, five hundred fifty-five thousand, eleven".