20212188 has 36 divisors (see below), whose sum is σ = 48991320. Its totient is φ = 6478080.

The previous prime is 20212187. The next prime is 20212223. The reversal of 20212188 is 88121202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83748 + ... + 83988.

It is an arithmetic number, because the mean of its divisors is an integer number (1360870).

Almost surely, 2^20212188 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 20212188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24495660).

20212188 is an abundant number, since it is smaller than the sum of its proper divisors (28779132).

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

20212188 is a wasteful number, since it uses less digits than its factorization.

20212188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 20212188 is about 4495.7967035888. The cubic root of 20212188 is about 272.3983314579.

The spelling of 20212188 in words is "twenty million, two hundred twelve thousand, one hundred eighty-eight".