20578224 has 40 divisors (see below), whose sum is σ = 53768880. Its totient is φ = 6780928.

The previous prime is 20578199. The next prime is 20578237. The reversal of 20578224 is 42287502.

It is a junction number, because it is equal to n+sod(n) for n = 20578191 and 20578200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1864 + ... + 6680.

It is an arithmetic number, because the mean of its divisors is an integer number (1344222).

Almost surely, 2^20578224 is an apocalyptic number.

20578224 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 20578224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26884440).

20578224 is an abundant number, since it is smaller than the sum of its proper divisors (33190656).

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

20578224 is a wasteful number, since it uses less digits than its factorization.

20578224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4917 (or 4911 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 20578224 is about 4536.3227398412. The cubic root of 20578224 is about 274.0328516563.

It can be divided in two parts, 20578 and 224, that added together give a palindrome (20802).

The spelling of 20578224 in words is "twenty million, five hundred seventy-eight thousand, two hundred twenty-four".