20752440 has 128 divisors (see below), whose sum is σ = 66493440. Its totient is φ = 5170176.

The previous prime is 20752411. The next prime is 20752441. The reversal of 20752440 is 4425702.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20752440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20752441) 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 31 ways as a sum of consecutive naturals, for example, 201429 + ... + 201531.

It is an arithmetic number, because the mean of its divisors is an integer number (519480).

Almost surely, 2^20752440 is an apocalyptic number.

20752440 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 20752440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33246720).

20752440 is an abundant number, since it is smaller than the sum of its proper divisors (45741000).

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

20752440 is a wasteful number, since it uses less digits than its factorization.

20752440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 209 counting only the distinct ones).

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

The square root of 20752440 is about 4555.4846064936. The cubic root of 20752440 is about 274.8040035945.

The spelling of 20752440 in words is "twenty million, seven hundred fifty-two thousand, four hundred forty".