20190240 has 144 divisors (see below), whose sum is σ = 78781248. Its totient is φ = 4612608.

The previous prime is 20190227. The next prime is 20190241. The reversal of 20190240 is 4209102.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20190241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9079 + ... + 11081.

It is an arithmetic number, because the mean of its divisors is an integer number (547092).

Almost surely, 2^20190240 is an apocalyptic number.

20190240 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 20190240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39390624).

20190240 is an abundant number, since it is smaller than the sum of its proper divisors (58591008).

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

20190240 is a wasteful number, since it uses less digits than its factorization.

20190240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2031 (or 2020 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20190240 is about 4493.3550939137. The cubic root of 20190240 is about 272.2996984962.

Adding to 20190240 its reverse (4209102), we get a palindrome (24399342).

The spelling of 20190240 in words is "twenty million, one hundred ninety thousand, two hundred forty".