20244240 has 120 divisors (see below), whose sum is σ = 70257408. Its totient is φ = 5218560.

The previous prime is 20244239. The next prime is 20244247. The reversal of 20244240 is 4244202.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20244247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21867 + ... + 22773.

Almost surely, 2^20244240 is an apocalyptic number.

20244240 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 20244240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35128704).

20244240 is an abundant number, since it is smaller than the sum of its proper divisors (50013168).

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

20244240 is a wasteful number, since it uses less digits than its factorization.

20244240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957 (or 948 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 20244240 is about 4499.3599544824. The cubic root of 20244240 is about 272.5422429812.

Adding to 20244240 its reverse (4244202), we get a palindrome (24488442).

The spelling of 20244240 in words is "twenty million, two hundred forty-four thousand, two hundred forty".