20880912 has 80 divisors (see below), whose sum is σ = 58815680. Its totient is φ = 6345216.

The previous prime is 20880911. The next prime is 20880953. The reversal of 20880912 is 21908802.

It is a self number, because there is not a number n which added to its sum of digits gives 20880912.

It is not an unprimeable number, because it can be changed into a prime (20880911) 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, 67863 + ... + 68169.

It is an arithmetic number, because the mean of its divisors is an integer number (735196).

Almost surely, 2^20880912 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 20880912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29407840).

20880912 is an abundant number, since it is smaller than the sum of its proper divisors (37934768).

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

20880912 is a wasteful number, since it uses less digits than its factorization.

20880912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440 (or 434 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 20880912 is about 4569.5636553176. The cubic root of 20880912 is about 275.3699132115.

The spelling of 20880912 in words is "twenty million, eight hundred eighty thousand, nine hundred twelve".