20013224 has 64 divisors (see below), whose sum is σ = 47744640. Its totient is φ = 7637760.

The previous prime is 20013223. The next prime is 20013239. The reversal of 20013224 is 42231002.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 20013199 and 20013208.

It is not an unprimeable number, because it can be changed into a prime (20013221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32342 + ... + 32954.

It is an arithmetic number, because the mean of its divisors is an integer number (746010).

Almost surely, 2^20013224 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 20013224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23872320).

20013224 is an abundant number, since it is smaller than the sum of its proper divisors (27731416).

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

20013224 is a wasteful number, since it uses less digits than its factorization.

20013224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690 (or 686 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20013224 is about 4473.6141988330. The cubic root of 20013224 is about 271.5015742430.

Adding to 20013224 its reverse (42231002), we get a palindrome (62244226).

It can be divided in two parts, 2001 and 3224, that added together give a palindrome (5225).

The spelling of 20013224 in words is "twenty million, thirteen thousand, two hundred twenty-four".