20799744 has 144 divisors (see below), whose sum is σ = 65342592. Its totient is φ = 5750784.

The previous prime is 20799743. The next prime is 20799763. The reversal of 20799744 is 44799702.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 20799696 and 20799705.

It is not an unprimeable number, because it can be changed into a prime (20799743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284892 + ... + 284964.

It is an arithmetic number, because the mean of its divisors is an integer number (453768).

Almost surely, 2^20799744 is an apocalyptic number.

20799744 is a gapful number since it is divisible by the number (24) 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 20799744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32671296).

20799744 is an abundant number, since it is smaller than the sum of its proper divisors (44542848).

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

20799744 is an equidigital number, since it uses as much as digits as its factorization.

20799744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 20799744 is about 4560.6736344536. The cubic root of 20799744 is about 275.0126451486.

Subtracting from 20799744 its sum of digits (42), we obtain a palindrome (20799702).

The spelling of 20799744 in words is "twenty million, seven hundred ninety-nine thousand, seven hundred forty-four".