20126641 has 4 divisors (see below), whose sum is σ = 20152692. Its totient is φ = 20100592.

The previous prime is 20126597. The next prime is 20126663. The reversal of 20126641 is 14662102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15374241 + 4752400 = 3921^2 + 2180^2 .

It is a cyclic number.

It is not a de Polignac number, because 20126641 - 2⁹ = 20126129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20126671) 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 3 ways as a sum of consecutive naturals, for example, 11830 + ... + 13423.

It is an arithmetic number, because the mean of its divisors is an integer number (5038173).

Almost surely, 2^20126641 is an apocalyptic number.

It is an amenable number.

20126641 is a deficient number, since it is larger than the sum of its proper divisors (26051).

20126641 is an equidigital number, since it uses as much as digits as its factorization.

20126641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26050.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20126641 is about 4486.2725062127. The cubic root of 20126641 is about 272.0134842292.

Adding to 20126641 its reverse (14662102), we get a palindrome (34788743).

The spelling of 20126641 in words is "twenty million, one hundred twenty-six thousand, six hundred forty-one".