20145424 has 40 divisors (see below), whose sum is σ = 43872192. Its totient is φ = 8891520.

The previous prime is 20145421. The next prime is 20145449. The reversal of 20145424 is 42454102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20145395 and 20145404.

It is not an unprimeable number, because it can be changed into a prime (20145421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2679 + ... + 6889.

Almost surely, 2^20145424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20145424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21936096).

20145424 is an abundant number, since it is smaller than the sum of its proper divisors (23726768).

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

20145424 is a wasteful number, since it uses less digits than its factorization.

20145424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4255 (or 4249 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 20145424 is about 4488.3654040196. The cubic root of 20145424 is about 272.0980759355.

Adding to 20145424 its reverse (42454102), we get a palindrome (62599526).

The spelling of 20145424 in words is "twenty million, one hundred forty-five thousand, four hundred twenty-four".