11801220 has 24 divisors (see below), whose sum is σ = 33043584. Its totient is φ = 3146976.

The previous prime is 11801201. The next prime is 11801227. The reversal of 11801220 is 2210811.

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 11801220.

It is not an unprimeable number, because it can be changed into a prime (11801227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98284 + ... + 98403.

It is an arithmetic number, because the mean of its divisors is an integer number (1376816).

Almost surely, 2^11801220 is an apocalyptic number.

11801220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11801220 is an abundant number, since it is smaller than the sum of its proper divisors (21242364).

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

11801220 is a wasteful number, since it uses less digits than its factorization.

11801220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196699 (or 196697 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 11801220 is about 3435.2903807393. The cubic root of 11801220 is about 227.6716572668.

It can be divided in two parts, 11801 and 220, that added together give a palindrome (12021).

The spelling of 11801220 in words is "eleven million, eight hundred one thousand, two hundred twenty".