20680340 has 24 divisors (see below), whose sum is σ = 43854720. Its totient is φ = 8191008.

The previous prime is 20680339. The next prime is 20680349. The reversal of 20680340 is 4308602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20680349) 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 7 ways as a sum of consecutive naturals, for example, 2960 + ... + 7079.

It is an arithmetic number, because the mean of its divisors is an integer number (1827280).

Almost surely, 2^20680340 is an apocalyptic number.

20680340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20680340 is an abundant number, since it is smaller than the sum of its proper divisors (23174380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20680340 is a wasteful number, since it uses less digits than its factorization.

20680340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10151 (or 10149 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20680340 is about 4547.5641831644. The cubic root of 20680340 is about 274.4853846939.

Adding to 20680340 its reverse (4308602), we get a palindrome (24988942).

The spelling of 20680340 in words is "twenty million, six hundred eighty thousand, three hundred forty".