20441840 has 20 divisors (see below), whose sum is σ = 47527464. Its totient is φ = 8176704.

The previous prime is 20441833. The next prime is 20441849. The reversal of 20441840 is 4814402.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20441849) 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, 127682 + ... + 127841.

Almost surely, 2^20441840 is an apocalyptic number.

20441840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20441840 is an abundant number, since it is smaller than the sum of its proper divisors (27085624).

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

20441840 is a wasteful number, since it uses less digits than its factorization.

20441840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255536 (or 255530 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 20441840 is about 4521.2653096230. The cubic root of 20441840 is about 273.4261169574.

The spelling of 20441840 in words is "twenty million, four hundred forty-one thousand, eight hundred forty".