20790216 has 64 divisors (see below), whose sum is σ = 59760000. Its totient is φ = 6689088.

The previous prime is 20790191. The next prime is 20790233. The reversal of 20790216 is 61209702.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 20790216.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4605 + ... + 7923.

It is an arithmetic number, because the mean of its divisors is an integer number (933750).

Almost surely, 2^20790216 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 20790216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29880000).

20790216 is an abundant number, since it is smaller than the sum of its proper divisors (38969784).

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

20790216 is a wasteful number, since it uses less digits than its factorization.

20790216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3363 (or 3353 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 20790216 is about 4559.6289322707. The cubic root of 20790216 is about 274.9706459026.

Adding to 20790216 its reverse (61209702), we get a palindrome (81999918).

The spelling of 20790216 in words is "twenty million, seven hundred ninety thousand, two hundred sixteen".