20955611 has 4 divisors (see below), whose sum is σ = 22188312. Its totient is φ = 19722912.

The previous prime is 20955601. The next prime is 20955647. The reversal of 20955611 is 11655902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20955611 - 2¹⁸ = 20693467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20955601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 616325 + ... + 616358.

It is an arithmetic number, because the mean of its divisors is an integer number (5547078).

Almost surely, 2^20955611 is an apocalyptic number.

20955611 is a deficient number, since it is larger than the sum of its proper divisors (1232701).

20955611 is a wasteful number, since it uses less digits than its factorization.

20955611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232700.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 20955611 is about 4577.7298959200. The cubic root of 20955611 is about 275.6978902180.

The spelling of 20955611 in words is "twenty million, nine hundred fifty-five thousand, six hundred eleven".