20688284 has 12 divisors (see below), whose sum is σ = 37372608. Its totient is φ = 10010400.

The previous prime is 20688277. The next prime is 20688287. The reversal of 20688284 is 48288602.

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 3 ways as a sum of consecutive naturals, for example, 83297 + ... + 83544.

It is an arithmetic number, because the mean of its divisors is an integer number (3114384).

Almost surely, 2^20688284 is an apocalyptic number.

It is an amenable number.

20688284 is a deficient number, since it is larger than the sum of its proper divisors (16684324).

20688284 is a wasteful number, since it uses less digits than its factorization.

20688284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166876 (or 166874 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 38.

The square root of 20688284 is about 4548.4375339231. The cubic root of 20688284 is about 274.5205264881.

The spelling of 20688284 in words is "twenty million, six hundred eighty-eight thousand, two hundred eighty-four".