20835438 has 64 divisors (see below), whose sum is σ = 50077440. Its totient is φ = 5709312.

The previous prime is 20835431. The next prime is 20835443. The reversal of 20835438 is 83453802.

It is a junction number, because it is equal to n+sod(n) for n = 20835399 and 20835408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20835431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24781 + ... + 25607.

It is an arithmetic number, because the mean of its divisors is an integer number (782460).

Almost surely, 2^20835438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20835438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25038720).

20835438 is an abundant number, since it is smaller than the sum of its proper divisors (29242002).

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

20835438 is a wasteful number, since it uses less digits than its factorization.

20835438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881.

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 20835438 is about 4564.5851947357. The cubic root of 20835438 is about 275.1698697042.

The spelling of 20835438 in words is "twenty million, eight hundred thirty-five thousand, four hundred thirty-eight".