20327840 has 96 divisors (see below), whose sum is σ = 53660880. Its totient is φ = 7225344.

The previous prime is 20327807. The next prime is 20327849. The reversal of 20327840 is 4872302.

It can be written as a sum of positive squares in 8 ways, for example, as 3254416 + 17073424 = 1804^2 + 4132^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (20327849) 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 15 ways as a sum of consecutive naturals, for example, 60152 + ... + 60488.

Almost surely, 2^20327840 is an apocalyptic number.

20327840 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 20327840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26830440).

20327840 is an abundant number, since it is smaller than the sum of its proper divisors (33333040).

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

20327840 is a wasteful number, since it uses less digits than its factorization.

20327840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20327840 is about 4508.6405933496. The cubic root of 20327840 is about 272.9168884743.

The spelling of 20327840 in words is "twenty million, three hundred twenty-seven thousand, eight hundred forty".