20440121 has 8 divisors (see below), whose sum is σ = 22048320. Its totient is φ = 18837072.

The previous prime is 20440111. The next prime is 20440151. The reversal of 20440121 is 12104402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20440121 - 2¹⁸ = 20177977 is a prime.

It is a Duffinian number.

It is a zygodrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 20440096 and 20440105.

It is not an unprimeable number, because it can be changed into a prime (20440111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12476 + ... + 14018.

It is an arithmetic number, because the mean of its divisors is an integer number (2756040).

Almost surely, 2^20440121 is an apocalyptic number.

It is an amenable number.

20440121 is a deficient number, since it is larger than the sum of its proper divisors (1608199).

20440121 is a wasteful number, since it uses less digits than its factorization.

20440121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 20440121 is about 4521.0752039753. The cubic root of 20440121 is about 273.4184524049.

Adding to 20440121 its reverse (12104402), we get a palindrome (32544523).

The spelling of 20440121 in words is "twenty million, four hundred forty thousand, one hundred twenty-one".