11111720 has 16 divisors (see below), whose sum is σ = 25001460. Its totient is φ = 4444672.

The previous prime is 11111707. The next prime is 11111747. The reversal of 11111720 is 2711111.

It can be written as a sum of positive squares in 2 ways, for example, as 10099684 + 1012036 = 3178^2 + 1006^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11111695 and 11111704.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138857 + ... + 138936.

Almost surely, 2^11111720 is an apocalyptic number.

11111720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111720 is an abundant number, since it is smaller than the sum of its proper divisors (13889740).

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

11111720 is a wasteful number, since it uses less digits than its factorization.

11111720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277804 (or 277800 counting only the distinct ones).

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

The square root of 11111720 is about 3333.4246654154. The cubic root of 11111720 is about 223.1483927225.

Adding to 11111720 its reverse (2711111), we get a palindrome (13822831).

The spelling of 11111720 in words is "eleven million, one hundred eleven thousand, seven hundred twenty".