20411321 has 4 divisors (see below), whose sum is σ = 23327232. Its totient is φ = 17495412.

The previous prime is 20411291. The next prime is 20411323. The reversal of 20411321 is 12311402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20411321 - 2¹⁴ = 20394937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20411296 and 20411305.

It is not an unprimeable number, because it can be changed into a prime (20411323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1457945 + ... + 1457958.

It is an arithmetic number, because the mean of its divisors is an integer number (5831808).

Almost surely, 2^20411321 is an apocalyptic number.

It is an amenable number.

20411321 is a deficient number, since it is larger than the sum of its proper divisors (2915911).

20411321 is an equidigital number, since it uses as much as digits as its factorization.

20411321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2915910.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 20411321 is about 4517.8889981937. Note that the first 3 decimals coincide. The cubic root of 20411321 is about 273.2899770944.

Adding to 20411321 its reverse (12311402), we get a palindrome (32722723).

The spelling of 20411321 in words is "twenty million, four hundred eleven thousand, three hundred twenty-one".