20185308 has 96 divisors (see below), whose sum is σ = 61528320. Its totient is φ = 5641920.

The previous prime is 20185271. The next prime is 20185331. The reversal of 20185308 is 80358102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14791 + ... + 16097.

It is an arithmetic number, because the mean of its divisors is an integer number (640920).

Almost surely, 2^20185308 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20185308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30764160).

20185308 is an abundant number, since it is smaller than the sum of its proper divisors (41343012).

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

20185308 is a wasteful number, since it uses less digits than its factorization.

20185308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344 (or 1336 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 20185308 is about 4492.8062499957. The cubic root of 20185308 is about 272.2775245567.

The spelling of 20185308 in words is "twenty million, one hundred eighty-five thousand, three hundred eight".