20033440 has 96 divisors (see below), whose sum is σ = 55931904. Its totient is φ = 6635520.

The previous prime is 20033423. The next prime is 20033441. The reversal of 20033440 is 4433002.

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 (20033441) 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, 34432 + ... + 35008.

It is an arithmetic number, because the mean of its divisors is an integer number (582624).

Almost surely, 2^20033440 is an apocalyptic number.

20033440 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 20033440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27965952).

20033440 is an abundant number, since it is smaller than the sum of its proper divisors (35898464).

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

20033440 is a wasteful number, since it uses less digits than its factorization.

20033440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630 (or 622 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 20033440 is about 4475.8730991841. The cubic root of 20033440 is about 271.5929609642.

Adding to 20033440 its reverse (4433002), we get a palindrome (24466442).

The spelling of 20033440 in words is "twenty million, thirty-three thousand, four hundred forty".