20452440 has 64 divisors (see below), whose sum is σ = 62868960. Its totient is φ = 5319680.

The previous prime is 20452429. The next prime is 20452463. The reversal of 20452440 is 4425402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2842 + ... + 6998.

Almost surely, 2^20452440 is an apocalyptic number.

20452440 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 20452440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31434480).

20452440 is an abundant number, since it is smaller than the sum of its proper divisors (42416520).

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

20452440 is a wasteful number, since it uses less digits than its factorization.

20452440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4212 (or 4208 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 20452440 is about 4522.4373959183. The cubic root of 20452440 is about 273.4733699773.

Adding to 20452440 its reverse (4425402), we get a palindrome (24877842).

The spelling of 20452440 in words is "twenty million, four hundred fifty-two thousand, four hundred forty".