20143224 has 24 divisors (see below), whose sum is σ = 54554760. Its totient is φ = 6714384.

The previous prime is 20143223. The next prime is 20143231. The reversal of 20143224 is 42234102.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×20143224² = 811498946228352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20143197 and 20143206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20143223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 139812 + ... + 139955.

It is an arithmetic number, because the mean of its divisors is an integer number (2273115).

Almost surely, 2^20143224 is an apocalyptic number.

20143224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20143224 is an abundant number, since it is smaller than the sum of its proper divisors (34411536).

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

20143224 is a wasteful number, since it uses less digits than its factorization.

20143224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279779 (or 279772 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 20143224 is about 4488.1203192428. The cubic root of 20143224 is about 272.0881706661.

Adding to 20143224 its reverse (42234102), we get a palindrome (62377326).

The spelling of 20143224 in words is "twenty million, one hundred forty-three thousand, two hundred twenty-four".