20384140 has 24 divisors (see below), whose sum is σ = 48922272. Its totient is φ = 6988800.

The previous prime is 20384113. The next prime is 20384149. The reversal of 20384140 is 4148302.

It is not an unprimeable number, because it can be changed into a prime (20384149) 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 7 ways as a sum of consecutive naturals, for example, 72661 + ... + 72940.

It is an arithmetic number, because the mean of its divisors is an integer number (2038428).

Almost surely, 2^20384140 is an apocalyptic number.

20384140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20384140 is an abundant number, since it is smaller than the sum of its proper divisors (28538132).

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

20384140 is a wasteful number, since it uses less digits than its factorization.

20384140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145617 (or 145615 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 20384140 is about 4514.8798433624. The cubic root of 20384140 is about 273.1686131605.

The spelling of 20384140 in words is "twenty million, three hundred eighty-four thousand, one hundred forty".