20671244 has 12 divisors (see below), whose sum is σ = 39463368. Its totient is φ = 9396000.

The previous prime is 20671241. The next prime is 20671247. The reversal of 20671244 is 44217602.

It is an interprime number because it is at equal distance from previous prime (20671241) and next prime (20671247).

It is not an unprimeable number, because it can be changed into a prime (20671241) 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 in 3 ways as a sum of consecutive naturals, for example, 234857 + ... + 234944.

It is an arithmetic number, because the mean of its divisors is an integer number (3288614).

Almost surely, 2^20671244 is an apocalyptic number.

It is an amenable number.

20671244 is a deficient number, since it is larger than the sum of its proper divisors (18792124).

20671244 is a wasteful number, since it uses less digits than its factorization.

20671244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469816 (or 469814 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20671244 is about 4546.5639773350. The cubic root of 20671244 is about 274.4451357554.

Adding to 20671244 its reverse (44217602), we get a palindrome (64888846).

The spelling of 20671244 in words is "twenty million, six hundred seventy-one thousand, two hundred forty-four".