20911041 has 10 divisors (see below), whose sum is σ = 31237602. Its totient is φ = 13940640.

The previous prime is 20911027. The next prime is 20911043. The reversal of 20911041 is 14011902.

It can be written as a sum of positive squares in only one way, i.e., 20657025 + 254016 = 4545^2 + 504^2 .

It is not a de Polignac number, because 20911041 - 2⁶ = 20910977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20911043) 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 9 ways as a sum of consecutive naturals, for example, 129000 + ... + 129161.

Almost surely, 2^20911041 is an apocalyptic number.

It is an amenable number.

20911041 is a deficient number, since it is larger than the sum of its proper divisors (10326561).

20911041 is an equidigital number, since it uses as much as digits as its factorization.

20911041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258173 (or 258164 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 20911041 is about 4572.8591712407. The cubic root of 20911041 is about 275.5022930124.

Adding to 20911041 its reverse (14011902), we get a palindrome (34922943).

The spelling of 20911041 in words is "twenty million, nine hundred eleven thousand, forty-one".