11280020 has 18 divisors (see below), whose sum is σ = 23719626. Its totient is φ = 4506000.

The previous prime is 11280011. The next prime is 11280041. The reversal of 11280020 is 2008211.

It can be written as a sum of positive squares in only one way, i.e., 9024016 + 2256004 = 3004^2 + 1502^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11279977 and 11280004.

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 5 ways as a sum of consecutive naturals, for example, 14645 + ... + 15395.

It is an arithmetic number, because the mean of its divisors is an integer number (1317757).

Almost surely, 2^11280020 is an apocalyptic number.

11280020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11280020 is an abundant number, since it is smaller than the sum of its proper divisors (12439606).

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

11280020 is an frugal number, since it uses more digits than its factorization.

11280020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511 (or 758 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 11280020 is about 3358.5741022047. The cubic root of 11280020 is about 224.2693666376.

Adding to 11280020 its reverse (2008211), we get a palindrome (13288231).

The spelling of 11280020 in words is "eleven million, two hundred eighty thousand, twenty".