20382840 has 128 divisors (see below), whose sum is σ = 69076800. Its totient is φ = 5412096.

The previous prime is 20382833. The next prime is 20382889. The reversal of 20382840 is 4828302.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 31 ways as a sum of consecutive naturals, for example, 87364 + ... + 87596.

Almost surely, 2^20382840 is an apocalyptic number.

20382840 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 20382840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34538400).

20382840 is an abundant number, since it is smaller than the sum of its proper divisors (48693960).

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

20382840 is an equidigital number, since it uses as much as digits as its factorization.

20382840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 20382840 is about 4514.7358726730. The cubic root of 20382840 is about 273.1628059210.

The spelling of 20382840 in words is "twenty million, three hundred eighty-two thousand, eight hundred forty".