20838936 has 64 divisors (see below), whose sum is σ = 54720000. Its totient is φ = 6604416.

The previous prime is 20838931. The next prime is 20838949. The reversal of 20838936 is 63983802.

It is a super-2 number, since 2×20838936² = 868522507224192, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20838894 and 20838903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20838931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54795 + ... + 55173.

It is an arithmetic number, because the mean of its divisors is an integer number (855000).

Almost surely, 2^20838936 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 20838936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27360000).

20838936 is an abundant number, since it is smaller than the sum of its proper divisors (33881064).

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

20838936 is a wasteful number, since it uses less digits than its factorization.

20838936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496 (or 492 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 20838936 is about 4564.9683460020. The cubic root of 20838936 is about 275.1852679941.

The spelling of 20838936 in words is "twenty million, eight hundred thirty-eight thousand, nine hundred thirty-six".