20289438 has 48 divisors (see below), whose sum is σ = 48886656. Its totient is φ = 6039360.

The previous prime is 20289403. The next prime is 20289439. The reversal of 20289438 is 83498202.

It is a super-2 number, since 2×20289438² = 823322588711688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20289439) 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, 5856 + ... + 8652.

It is an arithmetic number, because the mean of its divisors is an integer number (1018472).

Almost surely, 2^20289438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20289438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24443328).

20289438 is an abundant number, since it is smaller than the sum of its proper divisors (28597218).

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

20289438 is a wasteful number, since it uses less digits than its factorization.

20289438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2849 (or 2846 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 20289438 is about 4504.3798685280. The cubic root of 20289438 is about 272.7449213428.

The spelling of 20289438 in words is "twenty million, two hundred eighty-nine thousand, four hundred thirty-eight".