20868336 has 60 divisors (see below), whose sum is σ = 58715488. Its totient is φ = 6918912.

The previous prime is 20868319. The next prime is 20868343. The reversal of 20868336 is 63386802.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20868336.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44841 + ... + 45303.

Almost surely, 2^20868336 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20868336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29357744).

20868336 is an abundant number, since it is smaller than the sum of its proper divisors (37847152).

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

20868336 is a wasteful number, since it uses less digits than its factorization.

20868336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 20868336 is about 4568.1873866995. The cubic root of 20868336 is about 275.3146195300.

The spelling of 20868336 in words is "twenty million, eight hundred sixty-eight thousand, three hundred thirty-six".