20838864 has 40 divisors (see below), whose sum is σ = 54139392. Its totient is φ = 6906880.

The previous prime is 20838863. The next prime is 20838869. The reversal of 20838864 is 46883802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20838863) 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, 8032 + ... + 10304.

Almost surely, 2^20838864 is an apocalyptic number.

20838864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20838864 is an abundant number, since it is smaller than the sum of its proper divisors (33300528).

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

20838864 is a wasteful number, since it uses less digits than its factorization.

20838864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2475 (or 2469 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The square root of 20838864 is about 4564.9604598507. The cubic root of 20838864 is about 275.1849510655.

The spelling of 20838864 in words is "twenty million, eight hundred thirty-eight thousand, eight hundred sixty-four".