20731246 has 8 divisors (see below), whose sum is σ = 31820184. Its totient is φ = 10124520.

The previous prime is 20731241. The next prime is 20731247. The reversal of 20731246 is 64213702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20731246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120445 + ... + 120616.

It is an arithmetic number, because the mean of its divisors is an integer number (3977523).

Almost surely, 2^20731246 is an apocalyptic number.

20731246 is a deficient number, since it is larger than the sum of its proper divisors (11088938).

20731246 is a wasteful number, since it uses less digits than its factorization.

20731246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241106.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 20731246 is about 4553.1578053039. The cubic root of 20731246 is about 274.7104213477.

Adding to 20731246 its reverse (64213702), we get a palindrome (84944948).

The spelling of 20731246 in words is "twenty million, seven hundred thirty-one thousand, two hundred forty-six".