20208641 has 2 divisors, whose sum is σ = 20208642. Its totient is φ = 20208640.

The previous prime is 20208619. The next prime is 20208691. The reversal of 20208641 is 14680202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18671041 + 1537600 = 4321^2 + 1240^2 .

It is a cyclic number.

It is not a de Polignac number, because 20208641 - 2¹⁰ = 20207617 is a prime.

It is not a weakly prime, because it can be changed into another prime (20208611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10104320 + 10104321.

It is an arithmetic number, because the mean of its divisors is an integer number (10104321).

Almost surely, 2^20208641 is an apocalyptic number.

It is an amenable number.

20208641 is a deficient number, since it is larger than the sum of its proper divisors (1).

20208641 is an equidigital number, since it uses as much as digits as its factorization.

20208641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 20208641 is about 4495.4022066996. The cubic root of 20208641 is about 272.3823962970.

Adding to 20208641 its reverse (14680202), we get a palindrome (34888843).

The spelling of 20208641 in words is "twenty million, two hundred eight thousand, six hundred forty-one".