20855424 has 32 divisors (see below), whose sum is σ = 55398240. Its totient is φ = 6951680.

The previous prime is 20855423. The next prime is 20855453. The reversal of 20855424 is 42455802.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 20855391 and 20855400.

It is not an unprimeable number, because it can be changed into a prime (20855423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26772 + ... + 27539.

It is an arithmetic number, because the mean of its divisors is an integer number (1731195).

Almost surely, 2^20855424 is an apocalyptic number.

20855424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20855424 is an abundant number, since it is smaller than the sum of its proper divisors (34542816).

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

20855424 is an equidigital number, since it uses as much as digits as its factorization.

20855424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54328 (or 54316 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

The square root of 20855424 is about 4566.7739160155. The cubic root of 20855424 is about 275.2578254186.

The spelling of 20855424 in words is "twenty million, eight hundred fifty-five thousand, four hundred twenty-four".