20838708 has 72 divisors (see below), whose sum is σ = 59623200. Its totient is φ = 6311520.

The previous prime is 20838707. The next prime is 20838721. The reversal of 20838708 is 80783802.

It is a super-2 number, since 2×20838708² = 868503502218528, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20838707) 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, 9718 + ... + 11666.

It is an arithmetic number, because the mean of its divisors is an integer number (828100).

Almost surely, 2^20838708 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 20838708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29811600).

20838708 is an abundant number, since it is smaller than the sum of its proper divisors (38784492).

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

20838708 is a wasteful number, since it uses less digits than its factorization.

20838708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1979 (or 1965 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 20838708 is about 4564.9433731428. The cubic root of 20838708 is about 275.1842643844.

The spelling of 20838708 in words is "twenty million, eight hundred thirty-eight thousand, seven hundred eight".