20549384 has 8 divisors (see below), whose sum is σ = 38530110. Its totient is φ = 10274688.

The previous prime is 20549381. The next prime is 20549407. The reversal of 20549384 is 48394502.

It can be written as a sum of positive squares in only one way, i.e., 18232900 + 2316484 = 4270^2 + 1522^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20549381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1284329 + ... + 1284344.

Almost surely, 2^20549384 is an apocalyptic number.

It is an amenable number.

20549384 is a deficient number, since it is larger than the sum of its proper divisors (17980726).

20549384 is a wasteful number, since it uses less digits than its factorization.

20549384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2568679 (or 2568675 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 20549384 is about 4533.1428391349. The cubic root of 20549384 is about 273.9047744821.

The spelling of 20549384 in words is "twenty million, five hundred forty-nine thousand, three hundred eighty-four".