20912944 has 40 divisors (see below), whose sum is σ = 45153360. Its totient is φ = 9316608.

The previous prime is 20912923. The next prime is 20912989. The reversal of 20912944 is 44921902.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4299 + ... + 7765.

It is an arithmetic number, because the mean of its divisors is an integer number (1128834).

Almost surely, 2^20912944 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 20912944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22576680).

20912944 is an abundant number, since it is smaller than the sum of its proper divisors (24240416).

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

20912944 is a wasteful number, since it uses less digits than its factorization.

20912944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3517 (or 3511 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 20912944 is about 4573.0672420160. The cubic root of 20912944 is about 275.5106500802.

The spelling of 20912944 in words is "twenty million, nine hundred twelve thousand, nine hundred forty-four".