20155744 has 96 divisors (see below), whose sum is σ = 49351680. Its totient is φ = 7907328.

The previous prime is 20155703. The next prime is 20155747. The reversal of 20155744 is 44755102.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155747) 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 15 ways as a sum of consecutive naturals, for example, 255097 + ... + 255175.

It is an arithmetic number, because the mean of its divisors is an integer number (514080).

Almost surely, 2^20155744 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 20155744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24675840).

20155744 is an abundant number, since it is smaller than the sum of its proper divisors (29195936).

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

20155744 is a wasteful number, since it uses less digits than its factorization.

20155744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 20155744 is about 4489.5148958434. The cubic root of 20155744 is about 272.1445310309.

It can be divided in two parts, 201557 and 44, that added together give a square (201601 = 449²).

The spelling of 20155744 in words is "twenty million, one hundred fifty-five thousand, seven hundred forty-four".