201311220 has 48 divisors (see below), whose sum is σ = 614916288. Its totient is φ = 48802560.

The previous prime is 201311219. The next prime is 201311239. The reversal of 201311220 is 22113102.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 201311196 and 201311205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151849 + ... + 153168.

It is an arithmetic number, because the mean of its divisors is an integer number (12810756).

Almost surely, 2^201311220 is an apocalyptic number.

201311220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201311220 is an abundant number, since it is smaller than the sum of its proper divisors (413605068).

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

201311220 is a wasteful number, since it uses less digits than its factorization.

201311220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305040 (or 305038 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 201311220 is about 14188.4185165226. The cubic root of 201311220 is about 586.0787750296.

Adding to 201311220 its reverse (22113102), we get a palindrome (223424322).

The spelling of 201311220 in words is "two hundred one million, three hundred eleven thousand, two hundred twenty".