20140240 has 80 divisors (see below), whose sum is σ = 50621760. Its totient is φ = 7424000.

The previous prime is 20140213. The next prime is 20140243. The reversal of 20140240 is 4204102.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 20140240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20140243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80115 + ... + 80365.

It is an arithmetic number, because the mean of its divisors is an integer number (632772).

Almost surely, 2^20140240 is an apocalyptic number.

20140240 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 20140240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25310880).

20140240 is an abundant number, since it is smaller than the sum of its proper divisors (30481520).

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

20140240 is a wasteful number, since it uses less digits than its factorization.

20140240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 20140240 is about 4487.7878737748. The cubic root of 20140240 is about 272.0747343662.

Adding to 20140240 its reverse (4204102), we get a palindrome (24344342).

The spelling of 20140240 in words is "twenty million, one hundred forty thousand, two hundred forty".