11231220 has 288 divisors, whose sum is σ = 45045504. Its totient is φ = 2027520.

The previous prime is 11231219. The next prime is 11231243. The reversal of 11231220 is 2213211.

11231220 = T₁₀₁ + T₁₀₂ + ... + T₄₀₈.

It is a super-2 number, since 2×11231220² = 252280605376800, which contains 22 as substring.

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 = 11231196 and 11231205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 660652 + ... + 660668.

It is an arithmetic number, because the mean of its divisors is an integer number (156408).

Almost surely, 2^11231220 is an apocalyptic number.

11231220 is a gapful number since it is divisible by the number (10) 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 11231220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22522752).

11231220 is an abundant number, since it is smaller than the sum of its proper divisors (33814284).

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

11231220 is a wasteful number, since it uses less digits than its factorization.

11231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71 (or 58 counting only the distinct ones).

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

The square root of 11231220 is about 3351.3012398172. The cubic root of 11231220 is about 223.9454852458.

Adding to 11231220 its reverse (2213211), we get a palindrome (13444431).

Subtracting from 11231220 its reverse (2213211), we obtain a square (9018009 = 3003²).

The spelling of 11231220 in words is "eleven million, two hundred thirty-one thousand, two hundred twenty".