20032240 has 20 divisors (see below), whose sum is σ = 46575144. Its totient is φ = 8012864.

The previous prime is 20032237. The next prime is 20032249. The reversal of 20032240 is 4223002.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 20032240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20032249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125122 + ... + 125281.

Almost surely, 2^20032240 is an apocalyptic number.

20032240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20032240 is an abundant number, since it is smaller than the sum of its proper divisors (26542904).

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

20032240 is a wasteful number, since it uses less digits than its factorization.

20032240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250416 (or 250410 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 20032240 is about 4475.7390451187. The cubic root of 20032240 is about 271.5875380636.

Adding to 20032240 its reverse (4223002), we get a palindrome (24255242).

The spelling of 20032240 in words is "twenty million, thirty-two thousand, two hundred forty".