20324772 has 72 divisors (see below), whose sum is σ = 55908216. Its totient is φ = 6188544.

The previous prime is 20324771. The next prime is 20324789. The reversal of 20324772 is 27742302.

It can be written as a sum of positive squares in 4 ways, for example, as 20736 + 20304036 = 144^2 + 4506^2 .

It is not an unprimeable number, because it can be changed into a prime (20324771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63958 + ... + 64274.

It is an arithmetic number, because the mean of its divisors is an integer number (776503).

Almost surely, 2^20324772 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 20324772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27954108).

20324772 is an abundant number, since it is smaller than the sum of its proper divisors (35583444).

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

20324772 is a wasteful number, since it uses less digits than its factorization.

20324772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 472 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 27.

The square root of 20324772 is about 4508.3003449194. The cubic root of 20324772 is about 272.9031576969.

The spelling of 20324772 in words is "twenty million, three hundred twenty-four thousand, seven hundred seventy-two".