20005398 has 48 divisors (see below), whose sum is σ = 49870080. Its totient is φ = 5677488.

The previous prime is 20005397. The next prime is 20005429. The reversal of 20005398 is 89350002.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005393) 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, 22111 + ... + 22997.

It is an arithmetic number, because the mean of its divisors is an integer number (1038960).

Almost surely, 2^20005398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20005398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24935040).

20005398 is an abundant number, since it is smaller than the sum of its proper divisors (29864682).

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

20005398 is a wasteful number, since it uses less digits than its factorization.

20005398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081 (or 1078 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 20005398 is about 4472.7394290300. The cubic root of 20005398 is about 271.4661801733.

The spelling of 20005398 in words is "twenty million, five thousand, three hundred ninety-eight".