20109824 has 80 divisors (see below), whose sum is σ = 47663616. Its totient is φ = 8294400.

The previous prime is 20109811. The next prime is 20109829. The reversal of 20109824 is 42890102.

It is a junction number, because it is equal to n+sod(n) for n = 20109793 and 20109802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20109829) 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, 111014 + ... + 111194.

Almost surely, 2^20109824 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 20109824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23831808).

20109824 is an abundant number, since it is smaller than the sum of its proper divisors (27553792).

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

20109824 is an equidigital number, since it uses as much as digits as its factorization.

20109824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 20109824 is about 4484.3978414052. The cubic root of 20109824 is about 271.9377019955.

Adding to 20109824 its reverse (42890102), we get a palindrome (62999926).

The spelling of 20109824 in words is "twenty million, one hundred nine thousand, eight hundred twenty-four".