20109601 has 2 divisors, whose sum is σ = 20109602. Its totient is φ = 20109600.

The previous prime is 20109577. The next prime is 20109629. The reversal of 20109601 is 10690102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11229201 + 8880400 = 3351^2 + 2980^2 .

It is a cyclic number.

It is not a de Polignac number, because 20109601 - 2¹¹ = 20107553 is a prime.

It is not a weakly prime, because it can be changed into another prime (20100601) 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, 10054800 + 10054801.

It is an arithmetic number, because the mean of its divisors is an integer number (10054801).

Almost surely, 2^20109601 is an apocalyptic number.

It is an amenable number.

20109601 is a deficient number, since it is larger than the sum of its proper divisors (1).

20109601 is an equidigital number, since it uses as much as digits as its factorization.

20109601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 20109601 is about 4484.3729773515. The cubic root of 20109601 is about 271.9366968097.

Adding to 20109601 its reverse (10690102), we get a palindrome (30799703).

It can be divided in two parts, 2010 and 9601, that added together give a palindrome (11611).

The spelling of 20109601 in words is "twenty million, one hundred nine thousand, six hundred one".