20818868 has 24 divisors (see below), whose sum is σ = 43075200. Its totient is φ = 8614368.

The previous prime is 20818867. The next prime is 20818879. The reversal of 20818868 is 86881802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20818867) 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, 12008 + ... + 13631.

It is an arithmetic number, because the mean of its divisors is an integer number (1794800).

Almost surely, 2^20818868 is an apocalyptic number.

20818868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20818868 is an abundant number, since it is smaller than the sum of its proper divisors (22256332).

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

20818868 is a wasteful number, since it uses less digits than its factorization.

20818868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25679 (or 25677 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 41.

The square root of 20818868 is about 4562.7697728463. The cubic root of 20818868 is about 275.0969046916.

The spelling of 20818868 in words is "twenty million, eight hundred eighteen thousand, eight hundred sixty-eight".