20752784 has 40 divisors (see below), whose sum is σ = 45856440. Its totient is φ = 9013248.

The previous prime is 20752763. The next prime is 20752799. The reversal of 20752784 is 48725702.

It can be written as a sum of positive squares in 4 ways, for example, as 250000 + 20502784 = 500^2 + 4528^2 .

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 602 + ... + 6470.

It is an arithmetic number, because the mean of its divisors is an integer number (1146411).

Almost surely, 2^20752784 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 20752784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22928220).

20752784 is an abundant number, since it is smaller than the sum of its proper divisors (25103656).

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

20752784 is a wasteful number, since it uses less digits than its factorization.

20752784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5907 (or 5901 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 20752784 is about 4555.5223630227. The cubic root of 20752784 is about 274.8055220031.

The spelling of 20752784 in words is "twenty million, seven hundred fifty-two thousand, seven hundred eighty-four".