20925744 has 160 divisors (see below), whose sum is σ = 66662400. Its totient is φ = 5644800.

The previous prime is 20925743. The next prime is 20925761. The reversal of 20925744 is 44752902.

It is not an unprimeable number, because it can be changed into a prime (20925743) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 510364 + ... + 510404.

It is an arithmetic number, because the mean of its divisors is an integer number (416640).

Almost surely, 2^20925744 is an apocalyptic number.

20925744 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 20925744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33331200).

20925744 is an abundant number, since it is smaller than the sum of its proper divisors (45736656).

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

20925744 is a wasteful number, since it uses less digits than its factorization.

20925744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 20925744 is about 4574.4665262739. The cubic root of 20925744 is about 275.5668484022.

The spelling of 20925744 in words is "twenty million, nine hundred twenty-five thousand, seven hundred forty-four".