20205011 has 4 divisors (see below), whose sum is σ = 20229552. Its totient is φ = 20180472.

The previous prime is 20205001. The next prime is 20205023. The reversal of 20205011 is 11050202.

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 20205011 - 2²² = 16010707 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20204983 and 20205001.

It is not an unprimeable number, because it can be changed into a prime (20205001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10991 + ... + 12696.

It is an arithmetic number, because the mean of its divisors is an integer number (5057388).

Almost surely, 2^20205011 is an apocalyptic number.

20205011 is a deficient number, since it is larger than the sum of its proper divisors (24541).

20205011 is an equidigital number, since it uses as much as digits as its factorization.

20205011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24540.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 20205011 is about 4494.9984427139. The cubic root of 20205011 is about 272.3660863217.

Adding to 20205011 its reverse (11050202), we get a palindrome (31255213).

The spelling of 20205011 in words is "twenty million, two hundred five thousand, eleven".