20279744 has 42 divisors (see below), whose sum is σ = 42138600. Its totient is φ = 9682816.

The previous prime is 20279731. The next prime is 20279747. The reversal of 20279744 is 44797202.

It is a happy number.

It is a super-2 number, since 2×20279744² = 822536033411072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20279747) 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 5 ways as a sum of consecutive naturals, for example, 33557 + ... + 34155.

It is an arithmetic number, because the mean of its divisors is an integer number (1003300).

Almost surely, 2^20279744 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 20279744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21069300).

20279744 is an abundant number, since it is smaller than the sum of its proper divisors (21858856).

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

20279744 is an equidigital number, since it uses as much as digits as its factorization.

20279744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657 (or 624 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 20279744 is about 4503.3036761915. The cubic root of 20279744 is about 272.7014765635.

The spelling of 20279744 in words is "twenty million, two hundred seventy-nine thousand, seven hundred forty-four".