20381598 has 48 divisors (see below), whose sum is σ = 46981680. Its totient is φ = 6544800.

The previous prime is 20381593. The next prime is 20381651. The reversal of 20381598 is 89518302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20381593) 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, 201748 + ... + 201848.

It is an arithmetic number, because the mean of its divisors is an integer number (978785).

Almost surely, 2^20381598 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20381598, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23490840).

20381598 is an abundant number, since it is smaller than the sum of its proper divisors (26600082).

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

20381598 is a wasteful number, since it uses less digits than its factorization.

20381598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 20381598 is about 4514.5983210027. The cubic root of 20381598 is about 273.1572575431.

The spelling of 20381598 in words is "twenty million, three hundred eighty-one thousand, five hundred ninety-eight".