11720655 has 24 divisors (see below), whose sum is σ = 20442240. Its totient is φ = 6212160.

The previous prime is 11720647. The next prime is 11720671. The reversal of 11720655 is 55602711.

11720655 is a `hidden beast` number, since 1 + 1 + 7 + 2 + 0 + 655 = 666.

It is not a de Polignac number, because 11720655 - 2³ = 11720647 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7426 + ... + 8864.

It is an arithmetic number, because the mean of its divisors is an integer number (851760).

Almost surely, 2^11720655 is an apocalyptic number.

11720655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11720655 is a deficient number, since it is larger than the sum of its proper divisors (8721585).

11720655 is a wasteful number, since it uses less digits than its factorization.

11720655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631 (or 1628 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 11720655 is about 3423.5442161596. The cubic root of 11720655 is about 227.1523814006.

The spelling of 11720655 in words is "eleven million, seven hundred twenty thousand, six hundred fifty-five".