20671144 has 16 divisors (see below), whose sum is σ = 41740020. Its totient is φ = 9540480.

The previous prime is 20671139. The next prime is 20671151. The reversal of 20671144 is 44117602.

It can be written as a sum of positive squares in 2 ways, for example, as 17322244 + 3348900 = 4162^2 + 1830^2 .

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 3 ways as a sum of consecutive naturals, for example, 99277 + ... + 99484.

Almost surely, 2^20671144 is an apocalyptic number.

It is an amenable number.

20671144 is an abundant number, since it is smaller than the sum of its proper divisors (21068876).

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

20671144 is a wasteful number, since it uses less digits than its factorization.

20671144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198780 (or 198776 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20671144 is about 4546.5529800058. The cubic root of 20671144 is about 274.4446931993. Note that the first 3 decimals are identical.

Adding to 20671144 its reverse (44117602), we get a palindrome (64788746).

The spelling of 20671144 in words is "twenty million, six hundred seventy-one thousand, one hundred forty-four".