20911141 has 4 divisors (see below), whose sum is σ = 21118284. Its totient is φ = 20704000.

The previous prime is 20911129. The next prime is 20911157. The reversal of 20911141 is 14111902.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20666116 + 245025 = 4546^2 + 495^2 .

It is a cyclic number.

It is not a de Polignac number, because 20911141 - 2¹³ = 20902949 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 (20911171) 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, 103420 + ... + 103621.

It is an arithmetic number, because the mean of its divisors is an integer number (5279571).

Almost surely, 2^20911141 is an apocalyptic number.

It is an amenable number.

20911141 is a deficient number, since it is larger than the sum of its proper divisors (207143).

20911141 is a wasteful number, since it uses less digits than its factorization.

20911141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207142.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 20911141 is about 4572.8701053059. The cubic root of 20911141 is about 275.5027321773.

The spelling of 20911141 in words is "twenty million, nine hundred eleven thousand, one hundred forty-one".