20297286 has 48 divisors (see below), whose sum is σ = 47056464. Its totient is φ = 6300672.

The previous prime is 20297273. The next prime is 20297287. The reversal of 20297286 is 68279202.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20297286.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20297287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34285 + ... + 34871.

It is an arithmetic number, because the mean of its divisors is an integer number (980343).

Almost surely, 2^20297286 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20297286, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23528232).

20297286 is an abundant number, since it is smaller than the sum of its proper divisors (26759178).

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

20297286 is a wasteful number, since it uses less digits than its factorization.

20297286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725 (or 722 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20297286 is about 4505.2509364074. The cubic root of 20297286 is about 272.7800829248.

The spelling of 20297286 in words is "twenty million, two hundred ninety-seven thousand, two hundred eighty-six".