20411131 has 4 divisors (see below), whose sum is σ = 21981232. Its totient is φ = 18841032.

The previous prime is 20411129. The next prime is 20411141. The reversal of 20411131 is 13111402.

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 20411131 - 2¹ = 20411129 is a prime.

It is a super-2 number, since 2×20411131² = 833228537398322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 1570087 = 20411131 / (2 + 0 + 4 + 1 + 1 + 1 + 3 + 1).

It is not an unprimeable number, because it can be changed into a prime (20411141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 785031 + ... + 785056.

It is an arithmetic number, because the mean of its divisors is an integer number (5495308).

Almost surely, 2^20411131 is an apocalyptic number.

20411131 is a deficient number, since it is larger than the sum of its proper divisors (1570101).

20411131 is a wasteful number, since it uses less digits than its factorization.

20411131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570100.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 20411131 is about 4517.8679706251. The cubic root of 20411131 is about 273.2891291130.

Adding to 20411131 its reverse (13111402), we get a palindrome (33522533).

The spelling of 20411131 in words is "twenty million, four hundred eleven thousand, one hundred thirty-one".