20750240 has 96 divisors (see below), whose sum is σ = 56899584. Its totient is φ = 7004160.

The previous prime is 20750239. The next prime is 20750263. The reversal of 20750240 is 4205702.

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

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 15 ways as a sum of consecutive naturals, for example, 108545 + ... + 108735.

It is an arithmetic number, because the mean of its divisors is an integer number (592704).

Almost surely, 2^20750240 is an apocalyptic number.

20750240 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 20750240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28449792).

20750240 is an abundant number, since it is smaller than the sum of its proper divisors (36149344).

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

20750240 is a wasteful number, since it uses less digits than its factorization.

20750240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 20750240 is about 4555.2431329184. The cubic root of 20750240 is about 274.7942924445.

Adding to 20750240 its reverse (4205702), we get a palindrome (24955942).

The spelling of 20750240 in words is "twenty million, seven hundred fifty thousand, two hundred forty".