201131220 has 24 divisors (see below), whose sum is σ = 563167584. Its totient is φ = 53634976.

The previous prime is 201131219. The next prime is 201131257. The reversal of 201131220 is 22131102.

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 = 201131196 and 201131205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1676034 + ... + 1676153.

It is an arithmetic number, because the mean of its divisors is an integer number (23465316).

Almost surely, 2^201131220 is an apocalyptic number.

201131220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201131220 is an abundant number, since it is smaller than the sum of its proper divisors (362036364).

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

201131220 is a wasteful number, since it uses less digits than its factorization.

201131220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3352199 (or 3352197 counting only the distinct ones).

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

The square root of 201131220 is about 14182.0738962960. The cubic root of 201131220 is about 585.9040445183.

Adding to 201131220 its reverse (22131102), we get a palindrome (223262322).

The spelling of 201131220 in words is "two hundred one million, one hundred thirty-one thousand, two hundred twenty".