20681246 has 8 divisors (see below), whose sum is σ = 31248720. Its totient is φ = 10265008.

The previous prime is 20681239. The next prime is 20681249. The reversal of 20681246 is 64218602.

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

It is a super-2 number, since 2×20681246² = 855427872225032, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20681249) 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, 37466 + ... + 38013.

It is an arithmetic number, because the mean of its divisors is an integer number (3906090).

Almost surely, 2^20681246 is an apocalyptic number.

20681246 is a deficient number, since it is larger than the sum of its proper divisors (10567474).

20681246 is a wasteful number, since it uses less digits than its factorization.

20681246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75618.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 20681246 is about 4547.6637958407. The cubic root of 20681246 is about 274.4893930117.

Adding to 20681246 its reverse (64218602), we get a palindrome (84899848).

The spelling of 20681246 in words is "twenty million, six hundred eighty-one thousand, two hundred forty-six".