20204911 has 4 divisors (see below), whose sum is σ = 20307672. Its totient is φ = 20102152.

The previous prime is 20204903. The next prime is 20204927. The reversal of 20204911 is 11940202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11940202 = 2 ⋅5970101.

It is a cyclic number.

It is not a de Polignac number, because 20204911 - 2³ = 20204903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20204981) 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, 51085 + ... + 51478.

It is an arithmetic number, because the mean of its divisors is an integer number (5076918).

Almost surely, 2^20204911 is an apocalyptic number.

20204911 is a deficient number, since it is larger than the sum of its proper divisors (102761).

20204911 is a wasteful number, since it uses less digits than its factorization.

20204911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102760.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 20204911 is about 4494.9873192257. The cubic root of 20204911 is about 272.3656369834.

It can be divided in two parts, 20204 and 911, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20204911 in words is "twenty million, two hundred four thousand, nine hundred eleven".