20189800 has 72 divisors (see below), whose sum is σ = 49396950. Its totient is φ = 7665280.

The previous prime is 20189797. The next prime is 20189821. The reversal of 20189800 is 898102.

20189800 = T₉₆ + T₉₇ + ... + T₄₉₅.

It can be written as a sum of positive squares in 3 ways, for example, as 15163236 + 5026564 = 3894^2 + 2242^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 342171 + ... + 342229.

Almost surely, 2^20189800 is an apocalyptic number.

20189800 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 20189800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24698475).

20189800 is an abundant number, since it is smaller than the sum of its proper divisors (29207150).

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

20189800 is a wasteful number, since it uses less digits than its factorization.

20189800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 20189800 is about 4493.3061324597. The cubic root of 20189800 is about 272.2977204326.

The spelling of 20189800 in words is "twenty million, one hundred eighty-nine thousand, eight hundred".