13112220 has 48 divisors (see below), whose sum is σ = 40053888. Its totient is φ = 3178560.

The previous prime is 13112161. The next prime is 13112221. The reversal of 13112220 is 2221131.

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 = 13112196 and 13112205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13112221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9274 + ... + 10593.

It is an arithmetic number, because the mean of its divisors is an integer number (834456).

Almost surely, 2^13112220 is an apocalyptic number.

13112220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13112220 is an abundant number, since it is smaller than the sum of its proper divisors (26941668).

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

13112220 is a wasteful number, since it uses less digits than its factorization.

13112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19890 (or 19888 counting only the distinct ones).

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

The square root of 13112220 is about 3621.0799494074. The cubic root of 13112220 is about 235.8081127190.

Adding to 13112220 its reverse (2221131), we get a palindrome (15333351).

The spelling of 13112220 in words is "thirteen million, one hundred twelve thousand, two hundred twenty".