20841216 has 72 divisors (see below), whose sum is σ = 60535104. Its totient is φ = 6312960.

The previous prime is 20841211. The next prime is 20841229. The reversal of 20841216 is 61214802.

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

It is not an unprimeable number, because it can be changed into a prime (20841211) 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, 7215 + ... + 9681.

Almost surely, 2^20841216 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 20841216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30267552).

20841216 is an abundant number, since it is smaller than the sum of its proper divisors (39693888).

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

20841216 is a wasteful number, since it uses less digits than its factorization.

20841216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2497 (or 2483 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 20841216 is about 4565.2180670807. The cubic root of 20841216 is about 275.1953036877.

The spelling of 20841216 in words is "twenty million, eight hundred forty-one thousand, two hundred sixteen".