11671220 has 24 divisors (see below), whose sum is σ = 26738208. Its totient is φ = 4244000.

The previous prime is 11671217. The next prime is 11671237. The reversal of 11671220 is 2217611.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 11671192 and 11671201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26306 + ... + 26745.

It is an arithmetic number, because the mean of its divisors is an integer number (1114092).

Almost surely, 2^11671220 is an apocalyptic number.

11671220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11671220 is an abundant number, since it is smaller than the sum of its proper divisors (15066988).

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

11671220 is a wasteful number, since it uses less digits than its factorization.

11671220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53071 (or 53069 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 11671220 is about 3416.3167300471. The cubic root of 11671220 is about 226.8325726935.

Adding to 11671220 its reverse (2217611), we get a palindrome (13888831).

The spelling of 11671220 in words is "eleven million, six hundred seventy-one thousand, two hundred twenty".