20143216 has 40 divisors (see below), whose sum is σ = 41140224. Its totient is φ = 9535680.

The previous prime is 20143171. The next prime is 20143219. The reversal of 20143216 is 61234102.

It is a junction number, because it is equal to n+sod(n) for n = 20143193 and 20143202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20143219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46521 + ... + 46951.

Almost surely, 2^20143216 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 20143216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20570112).

20143216 is an abundant number, since it is smaller than the sum of its proper divisors (20997008).

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

20143216 is a wasteful number, since it uses less digits than its factorization.

20143216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589 (or 583 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20143216 is about 4488.1194280010. The cubic root of 20143216 is about 272.0881346456.

Adding to 20143216 its reverse (61234102), we get a palindrome (81377318).

The spelling of 20143216 in words is "twenty million, one hundred forty-three thousand, two hundred sixteen".