201711220 has 48 divisors (see below), whose sum is σ = 447955200. Its totient is φ = 76083840.

The previous prime is 201711217. The next prime is 201711227. The reversal of 201711220 is 22117102.

201711220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 201711194 and 201711203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201711227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89710 + ... + 91930.

It is an arithmetic number, because the mean of its divisors is an integer number (9332400).

Almost surely, 2^201711220 is an apocalyptic number.

201711220 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 201711220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223977600).

201711220 is an abundant number, since it is smaller than the sum of its proper divisors (246243980).

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

201711220 is a wasteful number, since it uses less digits than its factorization.

201711220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2488 (or 2486 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 201711220 is about 14202.5075250816. The cubic root of 201711220 is about 586.4666924898.

Adding to 201711220 its reverse (22117102), we get a palindrome (223828322).

It can be divided in two parts, 20171 and 1220, that multiplied together give a triangular number (24608620 = T₇₀₁₅).

The spelling of 201711220 in words is "two hundred one million, seven hundred eleven thousand, two hundred twenty".