20731244 has 6 divisors (see below), whose sum is σ = 36279684.
Its totient is φ = 10365620.
The previous prime is 20731241. The next prime is 20731247. The reversal of 20731244 is 44213702.
It is an interprime number because it is at equal distance from previous prime (20731241) and next prime (20731247).
It is not an unprimeable number, because it can be changed into a prime (20731241) 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, 2591402 + ... + 2591409.
It is an arithmetic number, because the mean of its divisors is an integer number (6046614).
Almost surely, 220731244 is an apocalyptic number.
It is an amenable number.
20731244 is a deficient number, since it is larger than the sum of its proper divisors (15548440).
20731244 is a wasteful number, since it uses less digits than its factorization.
20731244 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5182815 (or 5182813 counting only the distinct ones).
The product of its (nonzero) digits is 1344, while the sum is 23.
The square root of 20731244 is about 4553.1575856761.
The cubic root of 20731244 is about 274.7104125136.
Adding to 20731244 its reverse (44213702), we get a palindrome (64944946).
The spelling of 20731244 in words is "twenty million, seven hundred thirty-one thousand, two hundred forty-four".