20441400 has 192 divisors, whose sum is σ = 75233280. Its totient is φ = 4492800.

The previous prime is 20441363. The next prime is 20441401. The reversal of 20441400 is 414402.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20441400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20441401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 130122 + ... + 130278.

It is an arithmetic number, because the mean of its divisors is an integer number (391840).

Almost surely, 2^20441400 is an apocalyptic number.

20441400 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 20441400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37616640).

20441400 is an abundant number, since it is smaller than the sum of its proper divisors (54791880).

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

20441400 is a wasteful number, since it uses less digits than its factorization.

20441400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 20441400 is about 4521.2166504161. The cubic root of 20441400 is about 273.4241551583.

Adding to 20441400 its reverse (414402), we get a palindrome (20855802).

The spelling of 20441400 in words is "twenty million, four hundred forty-one thousand, four hundred".