20818224 has 120 divisors (see below), whose sum is σ = 70154240. Its totient is φ = 5629824.

The previous prime is 20818223. The next prime is 20818229. The reversal of 20818224 is 42281802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20818223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18609 + ... + 19695.

Almost surely, 2^20818224 is an apocalyptic number.

20818224 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 20818224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35077120).

20818224 is an abundant number, since it is smaller than the sum of its proper divisors (49336016).

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

20818224 is a wasteful number, since it uses less digits than its factorization.

20818224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127 (or 1118 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 20818224 is about 4562.6992011308. The cubic root of 20818224 is about 275.0940680943.

The spelling of 20818224 in words is "twenty million, eight hundred eighteen thousand, two hundred twenty-four".