20686307 has 4 divisors (see below), whose sum is σ = 21775080. Its totient is φ = 19597536.

The previous prime is 20686301. The next prime is 20686313. The reversal of 20686307 is 70368602.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20686301) and next prime (20686313).

It is a cyclic number.

It is not a de Polignac number, because 20686307 - 2⁴ = 20686291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20686301) 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, 544358 + ... + 544395.

It is an arithmetic number, because the mean of its divisors is an integer number (5443770).

Almost surely, 2^20686307 is an apocalyptic number.

20686307 is a deficient number, since it is larger than the sum of its proper divisors (1088773).

20686307 is a wasteful number, since it uses less digits than its factorization.

20686307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088772.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20686307 is about 4548.2202013535. The cubic root of 20686307 is about 274.5117816937.

The spelling of 20686307 in words is "twenty million, six hundred eighty-six thousand, three hundred seven".