20681343 has 18 divisors (see below), whose sum is σ = 30641832. Its totient is φ = 13441440.

The previous prime is 20681327. The next prime is 20681351. The reversal of 20681343 is 34318602.

It is a happy number.

It is not a de Polignac number, because 20681343 - 2⁴ = 20681327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20681303) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 14446 + ... + 15812.

It is an arithmetic number, because the mean of its divisors is an integer number (1702324).

Almost surely, 2^20681343 is an apocalyptic number.

20681343 is a deficient number, since it is larger than the sum of its proper divisors (9960489).

20681343 is a wasteful number, since it uses less digits than its factorization.

20681343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455 (or 1411 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20681343 is about 4547.6744606447. The cubic root of 20681343 is about 274.4898221514.

Adding to 20681343 its reverse (34318602), we get a palindrome (54999945).

The spelling of 20681343 in words is "twenty million, six hundred eighty-one thousand, three hundred forty-three".