20411440 has 120 divisors (see below), whose sum is σ = 56996352. Its totient is φ = 6773760.

The previous prime is 20411431. The next prime is 20411473. The reversal of 20411440 is 4411402.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 160657 + ... + 160783.

Almost surely, 2^20411440 is an apocalyptic number.

20411440 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 20411440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28498176).

20411440 is an abundant number, since it is smaller than the sum of its proper divisors (36584912).

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

20411440 is a wasteful number, since it uses less digits than its factorization.

20411440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 20411440 is about 4517.9021680422. The cubic root of 20411440 is about 273.2905081958.

Adding to 20411440 its reverse (4411402), we get a palindrome (24822842).

It can be divided in two parts, 2041 and 1440, that added together give a square (3481 = 59²).

The spelling of 20411440 in words is "twenty million, four hundred eleven thousand, four hundred forty".