201323220 has 96 divisors (see below), whose sum is σ = 666489600. Its totient is φ = 44427264.

The previous prime is 201323219. The next prime is 201323237. The reversal of 201323220 is 22323102.

201323220 = T₂₁ + T₂₂ + ... + T₁₀₆₄.

It is a super-2 number, since 2×201323220² = 81062077822336800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 201323220.

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, 3916 + ... + 20444.

It is an arithmetic number, because the mean of its divisors is an integer number (6942600).

Almost surely, 2^201323220 is an apocalyptic number.

201323220 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 201323220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (333244800).

201323220 is an abundant number, since it is smaller than the sum of its proper divisors (465166380).

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

201323220 is a wasteful number, since it uses less digits than its factorization.

201323220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16577 (or 16575 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 201323220 is about 14188.8413903321. The cubic root of 201323220 is about 586.0904200265.

Adding to 201323220 its reverse (22323102), we get a palindrome (223646322).

The spelling of 201323220 in words is "two hundred one million, three hundred twenty-three thousand, two hundred twenty".