20411320 has 64 divisors (see below), whose sum is σ = 48988800. Its totient is φ = 7632000.

The previous prime is 20411291. The next prime is 20411323. The reversal of 20411320 is 2311402.

It is a self number, because there is not a number n which added to its sum of digits gives 20411320.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 81195 + ... + 81445.

It is an arithmetic number, because the mean of its divisors is an integer number (765450).

Almost surely, 2^20411320 is an apocalyptic number.

20411320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20411320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24494400).

20411320 is an abundant number, since it is smaller than the sum of its proper divisors (28577480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20411320 is a wasteful number, since it uses less digits than its factorization.

20411320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20411320 is about 4517.8888875226. Note that the first 5 decimals coincide. The cubic root of 20411320 is about 273.2899726313.

Adding to 20411320 its reverse (2311402), we get a palindrome (22722722).

The spelling of 20411320 in words is "twenty million, four hundred eleven thousand, three hundred twenty".