20724444 has 96 divisors (see below), whose sum is σ = 59976000. Its totient is φ = 6144768.

The previous prime is 20724443. The next prime is 20724463. The reversal of 20724444 is 44442702.

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

20724444 is a modest number, since divided by 4444 gives 2072 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20724443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40462 + ... + 40970.

It is an arithmetic number, because the mean of its divisors is an integer number (624750).

Almost surely, 2^20724444 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 20724444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29988000).

20724444 is an abundant number, since it is smaller than the sum of its proper divisors (39251556).

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

20724444 is a wasteful number, since it uses less digits than its factorization.

20724444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564 (or 556 counting only the distinct ones).

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

The square root of 20724444 is about 4552.4107899002. The cubic root of 20724444 is about 274.6803735527.

The spelling of 20724444 in words is "twenty million, seven hundred twenty-four thousand, four hundred forty-four".