20744120 has 32 divisors (see below), whose sum is σ = 47206800. Its totient is φ = 8203008.

The previous prime is 20744111. The next prime is 20744167. The reversal of 20744120 is 2144702.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20744092 and 20744101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 647 + ... + 6473.

Almost surely, 2^20744120 is an apocalyptic number.

20744120 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 20744120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23603400).

20744120 is an abundant number, since it is smaller than the sum of its proper divisors (26462680).

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

20744120 is a wasteful number, since it uses less digits than its factorization.

20744120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5927 (or 5923 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 20744120 is about 4554.5713299936. The cubic root of 20744120 is about 274.7672741797.

Adding to 20744120 its reverse (2144702), we get a palindrome (22888822).

The spelling of 20744120 in words is "twenty million, seven hundred forty-four thousand, one hundred twenty".