20433140 has 96 divisors (see below), whose sum is σ = 53813760. Its totient is φ = 6345216.

The previous prime is 20433137. The next prime is 20433163. The reversal of 20433140 is 4133402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 187406 + ... + 187514.

It is an arithmetic number, because the mean of its divisors is an integer number (560560).

Almost surely, 2^20433140 is an apocalyptic number.

20433140 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 20433140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26906880).

20433140 is an abundant number, since it is smaller than the sum of its proper divisors (33380620).

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

20433140 is a wasteful number, since it uses less digits than its factorization.

20433140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20433140 is about 4520.3030871834. The cubic root of 20433140 is about 273.3873216114.

Adding to 20433140 its reverse (4133402), we get a palindrome (24566542).

The spelling of 20433140 in words is "twenty million, four hundred thirty-three thousand, one hundred forty".