20235040 has 144 divisors (see below), whose sum is σ = 58174200. Its totient is φ = 6623232.

The previous prime is 20235031. The next prime is 20235043. The reversal of 20235040 is 4053202.

It can be written as a sum of positive squares in 4 ways, for example, as 13454224 + 6780816 = 3668^2 + 2604^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (20235043) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 227316 + ... + 227404.

Almost surely, 2^20235040 is an apocalyptic number.

20235040 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 20235040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29087100).

20235040 is an abundant number, since it is smaller than the sum of its proper divisors (37939160).

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

20235040 is a wasteful number, since it uses less digits than its factorization.

20235040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 20235040 is about 4498.3374706662. The cubic root of 20235040 is about 272.5009510951.

Adding to 20235040 its reverse (4053202), we get a palindrome (24288242).

The spelling of 20235040 in words is "twenty million, two hundred thirty-five thousand, forty".