20681708 has 6 divisors (see below), whose sum is σ = 36192996. Its totient is φ = 10340852.

The previous prime is 20681701. The next prime is 20681711. The reversal of 20681708 is 80718602.

It is not an unprimeable number, because it can be changed into a prime (20681701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2585210 + ... + 2585217.

It is an arithmetic number, because the mean of its divisors is an integer number (6032166).

Almost surely, 2^20681708 is an apocalyptic number.

It is an amenable number.

20681708 is a deficient number, since it is larger than the sum of its proper divisors (15511288).

20681708 is a wasteful number, since it uses less digits than its factorization.

20681708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5170431 (or 5170429 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 20681708 is about 4547.7145908687. The cubic root of 20681708 is about 274.4914369433.

The spelling of 20681708 in words is "twenty million, six hundred eighty-one thousand, seven hundred eight".