11220765 has 32 divisors (see below), whose sum is σ = 19284480. Its totient is φ = 5551104.

The previous prime is 11220763. The next prime is 11220779. The reversal of 11220765 is 56702211.

It is not a de Polignac number, because 11220765 - 2¹ = 11220763 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19867 + ... + 20423.

It is an arithmetic number, because the mean of its divisors is an integer number (602640).

Almost surely, 2^11220765 is an apocalyptic number.

11220765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11220765 is a deficient number, since it is larger than the sum of its proper divisors (8063715).

11220765 is a wasteful number, since it uses less digits than its factorization.

11220765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 11220765 is about 3349.7410347667. The cubic root of 11220765 is about 223.8759743367.

Adding to 11220765 its reverse (56702211), we get a palindrome (67922976).

The spelling of 11220765 in words is "eleven million, two hundred twenty thousand, seven hundred sixty-five".