20444121 has 6 divisors (see below), whose sum is σ = 29530410. Its totient is φ = 13629408.

The previous prime is 20444113. The next prime is 20444147. The reversal of 20444121 is 12144402.

20444121 is a `hidden beast` number, since 204 + 441 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15515721 + 4928400 = 3939^2 + 2220^2 .

It is not a de Polignac number, because 20444121 - 2³ = 20444113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20444094 and 20444103.

It is not an unprimeable number, because it can be changed into a prime (20444111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1135776 + ... + 1135793.

It is an arithmetic number, because the mean of its divisors is an integer number (4921735).

Almost surely, 2^20444121 is an apocalyptic number.

It is an amenable number.

20444121 is a deficient number, since it is larger than the sum of its proper divisors (9086289).

20444121 is a wasteful number, since it uses less digits than its factorization.

20444121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2271575 (or 2271572 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 20444121 is about 4521.5175549808. The cubic root of 20444121 is about 273.4362866515.

Adding to 20444121 its reverse (12144402), we get a palindrome (32588523).

The spelling of 20444121 in words is "twenty million, four hundred forty-four thousand, one hundred twenty-one".