20686683 has 8 divisors (see below), whose sum is σ = 28781568. Its totient is φ = 13191464.

The previous prime is 20686681. The next prime is 20686691. The reversal of 20686683 is 38668602.

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

It is a cyclic number.

It is not a de Polignac number, because 20686683 - 2¹ = 20686681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20686681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149835 + ... + 149972.

It is an arithmetic number, because the mean of its divisors is an integer number (3597696).

Almost surely, 2^20686683 is an apocalyptic number.

20686683 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20686683 is a deficient number, since it is larger than the sum of its proper divisors (8094885).

20686683 is a wasteful number, since it uses less digits than its factorization.

20686683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299833.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 20686683 is about 4548.2615360157. The cubic root of 20686683 is about 274.5134448841.

The spelling of 20686683 in words is "twenty million, six hundred eighty-six thousand, six hundred eighty-three".