20289500 has 192 divisors, whose sum is σ = 60383232. Its totient is φ = 5760000.

The previous prime is 20289497. The next prime is 20289509. The reversal of 20289500 is 598202.

It is a self number, because there is not a number n which added to its sum of digits gives 20289500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20289509) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 654485 + ... + 654515.

It is an arithmetic number, because the mean of its divisors is an integer number (314496).

Almost surely, 2^20289500 is an apocalyptic number.

20289500 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 20289500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30191616).

20289500 is an abundant number, since it is smaller than the sum of its proper divisors (40093732).

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

20289500 is a wasteful number, since it uses less digits than its factorization.

20289500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85 (or 73 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 20289500 is about 4504.3867507131. The cubic root of 20289500 is about 272.7451991584.

The spelling of 20289500 in words is "twenty million, two hundred eighty-nine thousand, five hundred".