20444724 has 60 divisors (see below), whose sum is σ = 54123300. Its totient is φ = 6728832.

The previous prime is 20444719. The next prime is 20444729. The reversal of 20444724 is 42744402.

It is an interprime number because it is at equal distance from previous prime (20444719) and next prime (20444729).

It can be written as a sum of positive squares in 2 ways, for example, as 3305124 + 17139600 = 1818^2 + 4140^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20444729) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 28482 + ... + 29190.

It is an arithmetic number, because the mean of its divisors is an integer number (902055).

Almost surely, 2^20444724 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20444724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27061650).

20444724 is an abundant number, since it is smaller than the sum of its proper divisors (33678576).

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

20444724 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (20444723) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (814).

20444724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814 (or 803 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 27.

The square root of 20444724 is about 4521.5842356413. The cubic root of 20444724 is about 273.4389749624.

The spelling of 20444724 in words is "twenty million, four hundred forty-four thousand, seven hundred twenty-four".