20606686 has 8 divisors (see below), whose sum is σ = 32728320. Its totient is φ = 9697248.

The previous prime is 20606681. The next prime is 20606711. The reversal of 20606686 is 68660602.

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

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 606079 = 20606686 / (2 + 0 + 6 + 0 + 6 + 6 + 8 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20606681) 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, 303006 + ... + 303073.

It is an arithmetic number, because the mean of its divisors is an integer number (4091040).

Almost surely, 2^20606686 is an apocalyptic number.

20606686 is a deficient number, since it is larger than the sum of its proper divisors (12121634).

20606686 is a wasteful number, since it uses less digits than its factorization.

20606686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606098.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 20606686 is about 4539.4587783127. The cubic root of 20606686 is about 274.1591328797.

The spelling of 20606686 in words is "twenty million, six hundred six thousand, six hundred eighty-six".