20885424 has 80 divisors (see below), whose sum is σ = 62734080. Its totient is φ = 5863680.

The previous prime is 20885411. The next prime is 20885443. The reversal of 20885424 is 42458802.

It is a happy 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, 19987 + ... + 21005.

It is an arithmetic number, because the mean of its divisors is an integer number (784176).

Almost surely, 2^20885424 is an apocalyptic number.

20885424 is a gapful number since it is divisible by the number (24) 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 20885424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31367040).

20885424 is an abundant number, since it is smaller than the sum of its proper divisors (41848656).

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

20885424 is a wasteful number, since it uses less digits than its factorization.

20885424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098 (or 1092 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 33.

The square root of 20885424 is about 4570.0573300562. The cubic root of 20885424 is about 275.3897459910.

The spelling of 20885424 in words is "twenty million, eight hundred eighty-five thousand, four hundred twenty-four".