20684286 has 48 divisors (see below), whose sum is σ = 51577344. Its totient is φ = 5868432.

The previous prime is 20684281. The next prime is 20684309. The reversal of 20684286 is 68248602.

It is a self number, because there is not a number n which added to its sum of digits gives 20684286.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20684281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20551 + ... + 21533.

It is an arithmetic number, because the mean of its divisors is an integer number (1074528).

Almost surely, 2^20684286 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20684286, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25788672).

20684286 is an abundant number, since it is smaller than the sum of its proper divisors (30893058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20684286 is a wasteful number, since it uses less digits than its factorization.

20684286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165 (or 1162 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 20684286 is about 4547.9980211077. The cubic root of 20684286 is about 274.5028416997.

The spelling of 20684286 in words is "twenty million, six hundred eighty-four thousand, two hundred eighty-six".