20843140 has 24 divisors (see below), whose sum is σ = 43972992. Its totient is φ = 8298720.

The previous prime is 20843117. The next prime is 20843143. The reversal of 20843140 is 4134802.

It is not an unprimeable number, because it can be changed into a prime (20843143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2245 + ... + 6835.

It is an arithmetic number, because the mean of its divisors is an integer number (1832208).

Almost surely, 2^20843140 is an apocalyptic number.

20843140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20843140 is an abundant number, since it is smaller than the sum of its proper divisors (23129852).

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

20843140 is a wasteful number, since it uses less digits than its factorization.

20843140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4827 (or 4825 counting only the distinct ones).

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

The square root of 20843140 is about 4565.4287859959. The cubic root of 20843140 is about 275.2037718351.

Adding to 20843140 its reverse (4134802), we get a palindrome (24977942).

The spelling of 20843140 in words is "twenty million, eight hundred forty-three thousand, one hundred forty".