20189500 has 48 divisors (see below), whose sum is σ = 44553600. Its totient is φ = 7992000.

The previous prime is 20189497. The next prime is 20189513. The reversal of 20189500 is 598102.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74365 + ... + 74635.

It is an arithmetic number, because the mean of its divisors is an integer number (928200).

Almost surely, 2^20189500 is an apocalyptic number.

20189500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20189500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22276800).

20189500 is an abundant number, since it is smaller than the sum of its proper divisors (24364100).

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

20189500 is a wasteful number, since it uses less digits than its factorization.

20189500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 20189500 is about 4493.2727493443. The cubic root of 20189500 is about 272.2963717363.

The spelling of 20189500 in words is "twenty million, one hundred eighty-nine thousand, five hundred".