20011841 has 2 divisors, whose sum is σ = 20011842. Its totient is φ = 20011840.

The previous prime is 20011811. The next prime is 20011913. The reversal of 20011841 is 14811002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16321600 + 3690241 = 4040^2 + 1921^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011841 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20011811) 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 as a sum of consecutive naturals, namely, 10005920 + 10005921.

It is an arithmetic number, because the mean of its divisors is an integer number (10005921).

Almost surely, 2^20011841 is an apocalyptic number.

It is an amenable number.

20011841 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011841 is an equidigital number, since it uses as much as digits as its factorization.

20011841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 20011841 is about 4473.4596231552. The cubic root of 20011841 is about 271.4953201228.

Adding to 20011841 its reverse (14811002), we get a palindrome (34822843).

The spelling of 20011841 in words is "twenty million, eleven thousand, eight hundred forty-one".