20688286 has 16 divisors (see below), whose sum is σ = 33068304. Its totient is φ = 9673344.

The previous prime is 20688277. The next prime is 20688287. The reversal of 20688286 is 68288602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20688287) 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, 3676 + ... + 7408.

It is an arithmetic number, because the mean of its divisors is an integer number (2066769).

Almost surely, 2^20688286 is an apocalyptic number.

20688286 is a deficient number, since it is larger than the sum of its proper divisors (12380018).

20688286 is a wasteful number, since it uses less digits than its factorization.

20688286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3915.

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 20688286 is about 4548.4377537788. The cubic root of 20688286 is about 274.5205353343.

The spelling of 20688286 in words is "twenty million, six hundred eighty-eight thousand, two hundred eighty-six".