20838444 has 24 divisors (see below), whose sum is σ = 53043648. Its totient is φ = 6314640.

The previous prime is 20838439. The next prime is 20838449. The reversal of 20838444 is 44483802.

It is an interprime number because it is at equal distance from previous prime (20838439) and next prime (20838449).

It is a super-2 number, since 2×20838444² = 868481496682272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20838449) 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, 78802 + ... + 79065.

It is an arithmetic number, because the mean of its divisors is an integer number (2210152).

Almost surely, 2^20838444 is an apocalyptic number.

It is an amenable number.

20838444 is an abundant number, since it is smaller than the sum of its proper divisors (32205204).

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

20838444 is a wasteful number, since it uses less digits than its factorization.

20838444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157885 (or 157883 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 33.

The square root of 20838444 is about 4564.9144570298. The cubic root of 20838444 is about 275.1831023010.

The spelling of 20838444 in words is "twenty million, eight hundred thirty-eight thousand, four hundred forty-four".