20411121 has 8 divisors (see below), whose sum is σ = 27268960. Its totient is φ = 13580352.

The previous prime is 20411107. The next prime is 20411129. The reversal of 20411121 is 12111402.

It is a happy number.

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

It is not a de Polignac number, because 20411121 - 2⁵ = 20411089 is a prime.

It is a super-2 number, since 2×20411121² = 833227720953282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20411097 and 20411106.

It is not an unprimeable number, because it can be changed into a prime (20411129) 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, 4936 + ... + 8073.

It is an arithmetic number, because the mean of its divisors is an integer number (3408620).

Almost surely, 2^20411121 is an apocalyptic number.

It is an amenable number.

20411121 is a deficient number, since it is larger than the sum of its proper divisors (6857839).

20411121 is a wasteful number, since it uses less digits than its factorization.

20411121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13535.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 20411121 is about 4517.8668639082. The cubic root of 20411121 is about 273.2890844823.

Adding to 20411121 its reverse (12111402), we get a palindrome (32522523).

It can be divided in two parts, 204 and 11121, that added together give a triangular number (11325 = T₁₅₀).

The spelling of 20411121 in words is "twenty million, four hundred eleven thousand, one hundred twenty-one".