20361641 has 2 divisors, whose sum is σ = 20361642. Its totient is φ = 20361640.

The previous prime is 20361629. The next prime is 20361659. The reversal of 20361641 is 14616302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20286016 + 75625 = 4504^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 20361641 - 2¹⁰ = 20360617 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20361241) 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 as a sum of consecutive naturals, namely, 10180820 + 10180821.

It is an arithmetic number, because the mean of its divisors is an integer number (10180821).

Almost surely, 2^20361641 is an apocalyptic number.

It is an amenable number.

20361641 is a deficient number, since it is larger than the sum of its proper divisors (1).

20361641 is an equidigital number, since it uses as much as digits as its factorization.

20361641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20361641 is about 4512.3875055230. The cubic root of 20361641 is about 273.0680728509.

Adding to 20361641 its reverse (14616302), we get a palindrome (34977943).

The spelling of 20361641 in words is "twenty million, three hundred sixty-one thousand, six hundred forty-one".