20319216 has 80 divisors (see below), whose sum is σ = 57165984. Its totient is φ = 6193152.

The previous prime is 20319197. The next prime is 20319217. The reversal of 20319216 is 61291302.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20319217) 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, 29856 + ... + 30528.

Almost surely, 2^20319216 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 20319216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28582992).

20319216 is an abundant number, since it is smaller than the sum of its proper divisors (36846768).

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

20319216 is a wasteful number, since it uses less digits than its factorization.

20319216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738 (or 732 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 20319216 is about 4507.6841060571. The cubic root of 20319216 is about 272.8782884039.

The spelling of 20319216 in words is "twenty million, three hundred nineteen thousand, two hundred sixteen".