20544720 has 120 divisors (see below), whose sum is σ = 74129184. Its totient is φ = 4693248.

The previous prime is 20544707. The next prime is 20544743. The reversal of 20544720 is 2744502.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (24).

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 23 ways as a sum of consecutive naturals, for example, 10887 + ... + 12633.

Almost surely, 2^20544720 is an apocalyptic number.

20544720 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 20544720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37064592).

20544720 is an abundant number, since it is smaller than the sum of its proper divisors (53584464).

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

20544720 is a wasteful number, since it uses less digits than its factorization.

20544720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777 (or 1764 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 20544720 is about 4532.6283765603. The cubic root of 20544720 is about 273.8840506082.

The spelling of 20544720 in words is "twenty million, five hundred forty-four thousand, seven hundred twenty".