20916944 has 10 divisors (see below), whose sum is σ = 40526610. Its totient is φ = 10458464.

The previous prime is 20916943. The next prime is 20916947. The reversal of 20916944 is 44961902.

It can be written as a sum of positive squares in only one way, i.e., 18318400 + 2598544 = 4280^2 + 1612^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20916941) by changing a digit.

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 as a sum of consecutive naturals, namely, 653639 + ... + 653670.

It is an arithmetic number, because the mean of its divisors is an integer number (4052661).

Almost surely, 2^20916944 is an apocalyptic number.

It is an amenable number.

20916944 is a deficient number, since it is larger than the sum of its proper divisors (19609666).

20916944 is a wasteful number, since it uses less digits than its factorization.

20916944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307317 (or 1307311 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20916944 is about 4573.5045643358. The cubic root of 20916944 is about 275.5282145186.

The spelling of 20916944 in words is "twenty million, nine hundred sixteen thousand, nine hundred forty-four".